0001437749-23-007024 | 10-K | XBRL Viewer

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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2022	Mar. 17, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	000-54697
Entity Registrant Name	THE CORETEC GROUP INC.
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1479206
Entity Address, Address Line One	600 S. Wagner Rd
Entity Address, City or Town	Ann Arbor
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48103
City Area Code	866
Local Phone Number	916-0833
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 4,118,214
Entity Common Stock, Shares Outstanding (in shares)		268,871,202
Auditor Firm ID	483
Auditor Name	HOGANTAYLOR LLP
Auditor Location	Tulsa, Oklahoma
Entity Central Index Key	0001375195
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 2,356,348	$ 4,053,327
Prepaid expenses	114,201	133,491
Total current assets	2,470,549	4,186,818
Property and equipment, net	73,462	0
Other assets:
Intangibles, net	906,975	989,604
Goodwill	166,000	166,000
Deposits-other	4,550	16,343
Total other assets	1,077,525	1,171,947
Total Assets	3,621,536	5,358,765
Current liabilities:
Notes payable	61,398	0
Accounts payable and accrued expenses	316,992	307,096
Total current liabilities	378,390	307,096
Long term debt, net	1,414,826	1,187,518
Total Liabilities	1,793,216	1,494,614
Stockholders' equity:
Preferred stock, Series A convertible, $0.0002 par value, 500,000 shares authorized; 345,000 shares issued and outstanding at December 31, 2022 and 2021	69	69
Common stock $0.0002 par value, 1,500,000,000 shares authorized; 268,871,202 and 254,055,581 shares issued and outstanding at December 31, 2022 and 2021, respectively	53,772	50,809
Additional paid-in capital	18,119,792	17,295,262
Accumulated deficit	(16,345,313)	(13,481,989)
Total Stockholders' Equity	1,828,320	3,864,151
Total Liabilities and Stockholders' Equity	$ 3,621,536	$ 5,358,765

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.0002	$ 0.0002
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares outstanding (in shares)	345,000	345,000
Preferred stock, shares issued (in shares)	345,000	345,000
Common stock, par value (in dollars per share)	$ 0.0002	$ 0.0002
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Common stock, shares issued (in shares)	268,871,202	254,055,581
Common stock, shares outstanding (in shares)	268,871,202	254,055,581

Consolidated Statements of Operations - USD ($)	12 Months Ended
Consolidated Statements of Operations - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Income:
Revenue	$ 0	$ 0
Expenses:
Research and development	535,837	469,996
General and administrative	2,132,996	5,615,038
Interest	202,751	229,525
Total expenses	2,871,584	6,314,559
Other income	8,260	45,620
Net loss	$ (2,863,324)	$ (6,268,939)
Loss per share:
Basic and diluted (in dollars per share)	$ (0.011)	$ (0.026)
Weighted average shares outstanding, basic and diluted (in shares)	258,337,996	243,964,924

Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	345,000	213,751,145
Balance at Dec. 31, 2020	$ 69	$ 42,750	$ 8,033,313	$ (7,339,175)	$ 736,957
Cumulative change in accounting for beneficial conversion feature	0	0	(988,900)	126,125	(862,775)
Debt converted to common stock	$ 0	$ 1,613	263,845	0	265,458
Debt converted to common stock (in shares)		8,068,628
Common stock issued for liabilities (in shares)	0	2,343,495
Common stock issued for liabilities	$ 0	$ 468	94,383	0	94,851
Common stock issued for services (in shares)	0	3,392,313
Common stock issued for services	$ 0	$ 678	322,545	0	$ 323,223
Exchange of stock options for common stock (in shares)	0	3,000,000			3,000,000
Exchange of stock options for common stock	$ 0	$ 600	(600)	0	$ 0
Private placement stock issuance (in shares)	0	23,500,000
Private placement stock issuance	$ 0	$ 4,700	4,908,500	0	4,913,200
Warrants issued	0	0	62,785	0	62,785
Options issued for compensation and services	0	0	4,599,391	0	4,599,391
Net loss for the period	$ 0	$ 0	0	(6,268,939)	(6,268,939)
Balance (in shares) at Dec. 31, 2021	345,000	254,055,581
Balance at Dec. 31, 2021	$ 69	$ 50,809	17,295,262	(13,481,989)	3,864,151
Debt converted to common stock					0
Common stock issued for liabilities (in shares)	0	3,615,621
Common stock issued for liabilities	$ 0	$ 723	59,943	0	$ 60,666
Exchange of stock options for common stock (in shares)	0	900,000			900,000
Exchange of stock options for common stock	$ 0	$ 180	(180)	0	$ 0
Warrants issued	0	0	4,102	0	4,102
Options issued for compensation and services	0	0	761,695		761,695
Net loss for the period	$ 0	$ 0	0	(2,863,324)	(2,863,324)
Warrants exercised (in shares)	0	10,300,000
Warrants exercised	$ 0	$ 2,060	(1,030)	0	1,030
Balance (in shares) at Dec. 31, 2022	345,000	268,871,202
Balance at Dec. 31, 2022	$ 69	$ 53,772	$ 18,119,792	$ (16,345,313)	$ 1,828,320

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net loss	$ (2,863,324)	$ (6,268,939)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	6,803	0
Amortization - intangibles	82,629	81,429
Amortization - debt discount	61,660	95,661
Options issued for services	761,695	4,599,391
Common stock issued for compensation and services	0	323,223
Change in:
Prepaid expenses	19,289	46,472
Deposits	11,793	2,603
Accounts payable and accrued expenses	70,563	5,930
Net cash used in operating activities	(1,848,892)	(1,114,230)
Cash Flows from Investing Activities
Purchases of equipment	(80,265)	0
Capitalized website costs	0	(12,007)
Net cash used in investing activities	(80,265)	(12,007)
Cash Flows from Financing Activities
Payments on notes payable and long term debt	(40,046)	(90,505)
Proceeds from debt and warrants issued	271,194	334,650
Proceeds from exercised warrants	1,030	0
Proceeds from private placement stock issued	0	4,913,200
Net cash provided by financing activities	232,178	5,157,345
Net change in cash	(1,696,979)	4,031,108
Cash, beginning of period	4,053,327	22,219
Cash, end of period	2,356,348	4,053,327
Supplemental Disclosure of Cash flow Information
Cash paid during the period for interest	106,783	92,434
Non-Cash Financing Activities
Debt converted to common stock	0	265,458
Stock options exchanged for common stock	180	600
Common stock issued to satisfy liabilities	$ 60,666	$ 94,851

Note 1 - Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Business Description and Accounting Policies [Text Block]

Note 1 – Business and Summary of Significant Accounting Policies

Nature of Business

The Coretec Group Inc. (the “Group”) (formerly 3DIcon Corporation) (“3DIcon”) was incorporated on August 11, 1995, under the laws of the State of Oklahoma as First Keating Corporation. The articles of incorporation were amended August 1, 2003 to change the name to 3DIcon Corporation. During 2001, First Keating Corporation began to focus on the development of 360-degree holographic technology. From January 1, 2001, 3DIcon’s primary activity has been the raising of capital in order to pursue its goal of becoming a significant participant in the development, commercialization and marketing of next generation 3D display technologies.

Coretec Industries, LLC (“Coretec”), is a wholly owned subsidiary of the Group (collectively the “Company”). The Company is currently developing, testing, and providing new and/or improved technologies, products, and service solutions for energy-related industries including, but not limited to oil/gas, renewable energy, and distributed energy industries. Many of these technologies and products also have application for medical, electronic, photonic, display, and lighting markets among others. Early adoption of these technologies and products is anticipated in markets for energy storage (Li-ion batteries), renewable energy (BIPV), and electronics (Asset Monitoring).

Reverse Acquisition

On May 31, 2016, the Group entered into a Share Exchange Agreement (the “Share Exchange Agreement”) with Coretec and four Coretec members (the “Members”), which Members held all outstanding membership interests in Coretec. On September 30, 2016 (the “Closing Date”), the Group closed the transaction contemplated by the Share Exchange Agreement. Pursuant to the Share Exchange Agreement, the Members agreed to sell all their membership interests in Coretec to the Group in exchange for the Group’s issuance of an aggregate 4,760,872 shares of the Group’s Series B Convertible Preferred Stock to the Members (the “Exchange”). Coretec became a wholly owned subsidiary of the Group and the former Members beneficially owned approximately 65% of the Group’s common stock on a fully diluted basis on the Closing Date. Upon the closing of the Share Exchange Agreement, two of the Group’s Directors resigned and three new Directors associated with Coretec were nominated and elected, giving control of the board of directors to former Coretec Members.

Basis of Presentation

Under accounting principles generally accepted in the United States of America (“U.S. GAAP”), the acquisition is treated as a “reverse acquisition” under the purchase method of accounting. The consolidated statements of operations herein reflect the historical results of Coretec prior to the completion of the reverse acquisition since it was determined to be the accounting acquirer, and do not include the historical results of operations for 3DIcon prior to the completion of the acquisition. 3DIcon’s assets and liabilities were consolidated with the assets and liabilities of Coretec as of the September 30, 2016 consummation of the acquisition.

Principles of Consolidation

The consolidated financial statements include the accounts of the Group and its wholly owned subsidiary, Coretec. Intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and the disclosure of contingent assets and liabilities. Actual results could differ from the estimates and assumptions used.

Intangibles

Intangible assets consist of purchased patents and capitalized website costs. Intangible assets are recorded at the fair value as of the date of acquisition, and intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives.

Goodwill

Goodwill was acquired with the reverse acquisition. The Company evaluates the carrying value of goodwill on an annual basis and if events occur or circumstances change that would more likely than not reduce the fair value of goodwill below its carrying amount. When assessing whether goodwill is impaired, management considers first a qualitative approach to evaluate whether it is more likely than not the fair value of the goodwill is below its carrying amount; if so, management considers a quantitative approach by analyzing changes in performance and market-based metrics as compared to those used at the time of the initial acquisition. For the periods presented, no impairment charges were recognized.

Property and Equipment

Property and equipment are recorded at cost. Depreciation is recorded over the estimated useful lives using the straight-line method. Maintenance and repairs are expensed as incurred; major improvements and betterments are capitalized.

Estimated useful lives of property and equipment are as follows for the major classes of assets:

Asset Description	Estimated Lives (years)
Furniture and fixtures		7
Equipment		7

Impairment of Long-Lived Assets

Long-lived assets, such as intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, impairment is recognized to the extent that the carrying value exceeds its fair value. Fair value is determined through various valuation techniques including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.

Fair Value of Financial Instruments

The following methods and assumptions were used to estimate the fair value of each class of financial instrument held by the Company:

Current assets and current liabilities - The carrying value approximates fair value due to the short maturity of these items.

Notes payable - The fair value of the Company's notes payable has been estimated by the Company based upon the liability's characteristics, including interest rates, embedded instruments and conversion discounts. The carrying value approximates fair value after taking into consideration the liability’s characteristics.

Basic and Diluted Loss Per Common Share

Basic loss per common share is computed by dividing net loss by the weighted average number of vested common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other instruments to issue common stock were exercised or converted into common stock. The following securities are excluded from the calculation of weighted average dilutive common shares because their inclusion would have been anti-dilutive:

	December 31,
	2022		2021
Options		77,158,160		53,711,609
Warrants		132,514,000		142,604,000
Series A convertible preferred stock		115,000		115,000
Convertible debt		45,155,537		39,836,388
Total potentially dilutive shares		254,942,697		236,266,997

Research and Development

Research and development costs are expensed as incurred.

Income Taxes

The Company accounts for income taxes under an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s consolidated financial statements or tax returns. In estimating future tax consequences, the Company generally considers all expected future events other than enactments of changes in tax laws or rates. The effect on deferred tax assets and liabilities of a change in tax rates will be recognized as income or expense in the period that includes the enactment date. A valuation allowance is established when necessary to reduce deferred tax assets to the amount expected to be realized.

The Company’s tax benefits are fully offset by a valuation allowance due to the uncertainty that the deferred tax assets would be realized. Management considers the likelihood of changes by taxing authorities in its filed income tax returns and recognizes a liability for or discloses potential changes that management believes are more likely than not to occur upon examination by tax authorities. Management has not identified any uncertain tax positions in filed income tax returns that require recognition or disclosure in the accompanying consolidated financial statements.

Recent Accounting Pronouncements

The following is a summary of recent accounting pronouncement recently adopted by the Company:

In August 2020, the FASB issued ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40). This ASU simplifies the accounting for convertible instruments. The guidance removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments. As a result, after adopting ASU 2020-06, the Company will no longer separately present the embedded conversion feature of its convertible debt within stockholders’ equity and interest expense is expected to decrease due to the elimination of the related debt discount amortization. The Company adopted ASU 2020-06 under the modified retrospective approach effective January 1, 2021.

The cumulative impact of using the modified retrospective approach for the adoption of ASU 2020-06 on our consolidated balance sheet as of January 1, 2021 is summarized below:

	Balance at December 31, 2020			Impact of ASU 2020-06			Balance with Adoption of ASU 2020-06
Liabilities
Long-term debt, net	$	266,598		$	862,775		$	1,129,373
Equity
Additional paid-in-capital	$	8,033,313		$	(988,900	)	$	7,044,413
Accumulated deficit	$	(7,339,175	)	$	126,125		$	(7,213,050	)

In May 2021, the FASB issued ASU 2021-04, Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options which clarifies the accounting for a modification or an exchange of a freestanding equity-classified written call option that remains equity classified after a modification or exchange and the related EPS effects of such transaction if recognized as an adjustment to equity. The Company adopted ASU 2021-04 on January 1, 2022. The Company did not have any modification or exchanges of freestanding written call options classified in equity during the reporting period, and therefore, it did not have a material impact on its financial statements.

Note 2 - Recent Capital Financing and Management's Plans

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Substantial Doubt about Going Concern [Text Block]

Note 2 – Recent Capital Financing and Management’s Plans

On March 2, 2021, the Company entered into a securities purchase agreement (the “Purchase Agreement”) with a single institutional investor in a private placement to sell (i) 23,500,000 shares of its common stock, (ii) pre-funded warrants to purchase up to an aggregate of 51,500,000 shares of its common stock, and (iii) warrants to purchase up to an aggregate of 82,500,000 shares of its common stock for gross proceeds of approximately $6,000,000. The combined purchase price for one share of common stock and associated Warrant is $0.08 and for one Pre-Funded Warrant and associated Warrant is $0.0799. The sale of the securities under the Purchase Agreement closed on March 5, 2021.

Management is committed to utilizing this capital to expand and accelerate the development of its technology, while scaling business functions and appropriately adding resources necessary for future growth.

Note 3 - Intangibles

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Intangible Assets Disclosure [Text Block]

Note 3 – Intangibles

The following table sets forth patents:

	December 31,			December 31,
Patents	2022			2021
Gross carrying amount	$	1,400,000		$	1,400,000
Accumulated amortization		(501,433	)		(421,203	)
	$	898,567		$	978,797

The patents were acquired with the September 30, 2016 reverse acquisition. Amortization expense for the next five fiscal years and thereafter is expected to be approximately $80,000 annually through the year ended December 31, 2034.

Intangible assets include $12,007 of capitalized website costs incurred during the year ended December 31, 2021. Amortization expense and accumulated amortization was $2,400 for the year ended December 31, 2022 and $1,200 for the year ended December 31, 2021, respectively. Amortization expense for the next four and one-half fiscal years is expected to be approximately $2,400, annually.

Note 4 - Debt

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Debt Disclosure [Text Block]

Note 4 – Debt

Notes payable and long-term debt consists of the following:

	December 31,			December 31,
	2022			2021
Notes payable:
5.26% Insurance premium finance agreement due June 2023	$	61,398		$	-
Notes payable - current	$	61,398		$	-


Long term debt:
10% Promissory note due January 2024	$	1,485,617		$	1,310,617
Less:
Warrants issued		(51,755	)		(93,928	)
Debt issue costs		(19,036	)		(29,171	)
Total long term debt	$	1,414,826		$	1,187,518

5.26% Insurance premium finance agreement, due June 2023

The Company entered into an insurance financing agreement in August 2022 totaling $101,444. The monthly payments under the agreement are due in ten installments of $10,391 each.

10% Promissory note, net

On October 4, 2019, the Company entered into a Credit Agreement and related Promissory Note with Diversified Alpha Fund of Navigator Global Fund Manager Platform SPC (“DAF”), the Lender. DAF is a segregated portfolio fund of Navigator Global Fund Manager Platform SPC. DAF is managed and controlled by Mollitium Investment Management (Mollitium). Mollitium utilizes Diversified Global Investment Advisors Ltd. (“DGIA”) to act in an advisory role. DGIA maintains an Investment Committee to support the services to Mollitium. Simon Calton serves as part of this five-member investment committee and in accordance with the investment committee’s guidelines, Mr. Calton does not participate in matters or voting that pertain to the Company due to his conflict of interest. Investment advice provided by DGIA to Mollitium are recommendations only and the final decision on actions are the responsibility of Mollitium. Carlton James Global Management, Ltd (CJGM) serves as a distributer of investments by introducing funds available to the market of which DAF is included in CJGM’s group of funds. Compensation to CJGM occurs when investments are made into funds that they introduce. CJGM is part of the Carlton James Group of which Mr. Calton is CEO.

The 10% Promissory Note, in a principal amount of $2,500,000, is due on the 15th day of the 4th anniversary of each advance with the first capital payment due on March 15, 2024. The Promissory Note has attached warrants to subscribe for and purchase 3,000,000 shares of common stock at an exercise price of $0.052 per share. Under the terms of the Credit Agreement, DAF will fund the Promissory Note in sixteen (16) tranches in amounts of $125,000 and $175,000 per month beginning in October 2019. The funding of the Promissory Note is at the discretion of DAF and may differ from the planned schedule. As of December 31, 2022, DAF has advanced $2,345,000 with no definitive date or commitment to advance the remaining $155,000. Interest is accrued monthly and paid in advance for the first six months and thereafter interest only payments shall be paid quarterly.

On November 16, 2021, the Company countersigned a letter of variation (the Variation) to the credit agreement entered into, on October 4, 2019, with DAF. Pursuant to the Variation, the Lender agreed to extend the repayment days for each advance made by Lender under the credit agreement until the fourth anniversary of such advance. DAF has also communicated to the Company that interest only payments are due on a quarterly basis, commencing in January of 2022.

Under the terms of the Credit Agreement, DAF has the right to elect to convert all or part of the Promissory Note at a price equal to seventy percent (70%) of the average closing price of the Company’s common stock as reported on the over-the-counter quotation system on the OTC Markets during the fifteen (15) calendar days prior to the loan closing date of October 4, 2019, which calculates to $0.0329 per share.

The embedded conversion option was deemed to be a beneficial conversion feature because the active conversion price was less than the commitment date market price of the common stock. Given the terms of the agreement, the commitment date was determined to be the date the funds are advanced to the Company and is limited to the funding value less other debt discounts (see below). A debt discount of $862,775 was recorded, with a corresponding credit to additional paid-in capital, for the beneficial conversion feature as of December 31, 2020. On January 1, 2021, the Company adopted ASU 2020-06 under the modified retrospective approach for the fiscal year of 2021 (see Note 1). Adoption resulted in an approximate $989,000 decrease in additional paid in capital from the derecognition of the beneficial conversion feature, $863,000 increase in long term debt from the derecognition of the discount associated with the beneficial conversion feature and $126,000 decrease to the opening balance of accumulated deficit, representing the cumulative interest expense recognized related to the amortization of the beneficial conversion feature.

Under the terms of the Credit Agreement, warrants to subscribe for and purchase 3,000,000 shares of common stock at an exercise price of $0.052 per share were issued to DAF. The estimated value of the warrants granted monthly, with each advance, is calculated using the Black-Scholes option pricing model. The resulting estimated value of the warrant is used to proportionally allocate the fair value of the debt advance and the fair value of the warrants.

The allocated cost of the warrants amounted to $4,102 and $62,784 for the years ended December 31, 2022 and 2021, respectively, and is being amortized over the life of the debt with $46,275 and $47,230 of allocated costs amortized during the years ended December 31, 2022 and 2021, respectively. See Note 6 for more information on the warrants.

Additionally, under the terms of the Credit Agreement, the Company agreed to pay a commitment fee of 3% of each advance and reimburse DAF for certain expenses in connection with the preparation, interpretation, performance and enforcement of the Credit Agreement. Those costs amounted to $5,250 and $10,350 during the years ended December 31, 2022 and 2021, respectively, and are being amortized over the life of the debt with $15,385 and $14,125 amortized during the years ended December 31, 2022 and 2021, respectively.

On March 31, 2021, DAF converted $50,000 of the principle of the Promissory Note into 1,519,757 shares of common stock at $0.0329 per share. Related charges were made to interest expense for debt issue costs of $5,513 for the warrants and $1,346 for the deferred cost, through March 31, 2021.

On April 29, 2021, DAF converted $180,000 of the principle of the Promissory Note into 5,471,125 shares of common stock at $0.0329 per share. Related charges were made to interest expense for debt issue costs of $16,429 for the warrants and $3,772 for the deferred cost, through April 29, 2021.

On September 30, 2021, the Company paid DAF $102,606 for principal ($43,925) and interest ($58,681).

On October 27, 2021, DAF converted $35,458 of the principle of the Promissory Note into 1,077,746 shares of common stock at $0.0329 per share. Related charges for the principal payment and the debt conversion were made to interest expense in the amounts of $5,850 for the warrants and $1,523 for the deferred cost.

On July 15, 2022 DAF, advanced gross proceeds for $175,000 to the Company under the terms of the credit agreement.

Interest payments were made to DAF from invoiced amounts total for $131,357 and $30,572 during the years ended December 31, 2022 and 2021, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI https://asc.fasb.org/topic&trid=2208564

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Note 5 - Equity Incentive Plans

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

Note 5 – Equity Incentive Plans

In January 2018, the Company’s 2018 Equity Incentive Plan (the “2018 EIP”) was established. The total number of shares of stock which may be purchased or granted directly by options, stock awards or restricted stock purchase offers, or purchased indirectly through exercise of options granted under the 2018 EIP shall not exceed fifteen million (15,000,000) shares. The shares are included in a registration statement filed January 2018. There were 2,682,830 shares available for issuance under the 2018 EIP as of December 31, 2022.

On September 30, 2021, the Board of Directors approved The Coretec Group, Inc. 2021 Equity Incentive Plan (“2021 EIP”) which covers the potential issuance of 62,000,000 shares of common stock, from which various awards may be granted, including but not limited to: (a) Incentive Stock Options, (b) Non-qualified Stock Options, (c) Stock Appreciation Rights, (d) Restricted Awards, (e) Performance Share Awards, and (f) Performance Cash Awards. There were 50,000 shares available for issuance under the 2021 EIP as of December 31, 2022.

Note 6 - Common Stock, Preferred Stock, Warrants and Options

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Stockholders' Equity Note Disclosure [Text Block]

Note 6 – Common Stock, Preferred Stock, Warrants and Options

Common Stock

On June 8, 2020, the Board of Directors consented to a share exchange agreement with holders of 21,500,000 options awarded on August 7, 2019. The agreement allows for holders to exchange their options for rule 144 common stock at an exchange rate of 0.6 shares per 1 option. Under the exchange agreement, 1,500,000 and 5,000,000 options were exchanged for 900,000 and 3,000,000 shares of common stock during the years ended December 31, 2022 and 2021, respectively.

On October 22, 2020, the Board of Directors consented to satisfying accrued liabilities of vendors by issuing common stock from the 2018 Equity Incentive Plan from August 26, 2020 through September 1, 2021. The number of shares issued to satisfy a liability was determined by the average closing price for the fifteen (15) days prior to conversion at a discount rate of 50% to that fifteen (15) day average. On November 10, 2021, the Board of Directors consented to continue this practice through September 1, 2022. As part of this written consent, the Board of Directors included the use of both the 2018 and 2021 Equity Incentive Plans. On October 14, 2022 the Board of Directors further consented to extend this practice through September 1, 2023.

The stock issuance, in lieu of cash payment, requires written approval of the Chief Executive Officer. During the year ended December 31, 2022, 3,615,621 shares were issued to satisfy $60,666 of vendor accrued liabilities and services. During the year ended December 31, 2021, the Company issued 5,735,808 shares to satisfy $418,074 of vendor accrued liabilities and services.

Series A Convertible Preferred Stock

A total of 500,000 shares of Series A Convertible Preferred Stock (the “Series A Preferred Stock”) have been authorized for issuance under the Certificate of Designation of Preferences, Rights and Limitation of Series A Convertible Preferred Stock of the Company (the “Certificate of Designation”), which Certificate of Designation was filed with the Secretary of State of the State of Oklahoma on December 11, 2013. The shares of Series A Preferred Stock have a par value of $0.0002 per share and a stated value of $1.00 per share (the “Stated Value”) and shall receive a dividend of 6% of their Stated Value per annum payable or upon conversion or redemption of Series A Preferred at the option of the Company. We have not paid any cash or stock dividends to the holders of our Series A Preferred Stock. Dividends in arrears totaled approximately $190,000 and $169,000 for the years ended December 31, 2022 and 2021, respectively. Under the Certificate of Designation, the holders of the Series A Preferred Stock have the following rights, preferences and privileges:

The Series A Preferred Stock may, at the option of the holder, be converted at any time after the first anniversary of the issuance of the Series A Preferred Stock or from time to time thereafter into 166,667 post-split shares of common stock that such holder is entitled to in proportion to the 500,000 shares of Series A Preferred so designated in the Certificate of Designation.

The Series A Preferred Stock will automatically be converted into common stock anytime the post-split 5-day Volume-Weighted Average Price (VWAP) of the Company’s common stock prior to such conversion is equal to $15.00 or more. Such mandatory conversion would be converted by the same method described above for discretionary conversions.

Except as otherwise required by law, the holders of shares of Series A Preferred Stock shall not have voting rights or powers.

In the event of any (i) liquidation, dissolution or winding up of the Company, whether voluntary or involuntary, or ii) sale, merger, consolidation, reorganization or other transaction that results in a change of control of the Company, each holder of a share of Series A Preferred shall be entitled to receive, subject to prior preferences and other rights of any class or series of stock of the Company senior to the Series A Preferred, but prior and in preference to any distribution of any of the assets or surplus funds of the Company to holders of Common Stock, or any other class or series of stock of the Company junior to the Series A Preferred, an amount equal to the Stated Value plus accrued and unpaid dividends (as adjusted for any stock dividends, combinations or splits with respect to such shares) (the “Preference Amount”). After such payment has been made to the holders of Series A Preferred of the full Preference Amount to which such holders shall be entitled, the remaining net assets of the Company available for distribution, if any, shall be distributed pro rata among the holders of Common Stock. In the event the funds or assets legally available for distribution to the holders of Series A Preferred are insufficient to pay the Preference Amount, then all funds or assets available for distribution to the holders of capital stock shall be paid to the holders of Series A Preferred pro rata based on the full Preference Amount to which they are entitled.

The Company may not declare, pay or set aside any dividends on shares of any class or series of capital stock of the Company (other than dividends on shares of Common Stock payable in shares of Common Stock) unless the holders of the Series A Preferred Stock shall first receive, or simultaneously receive, a dividend on each outstanding share of Series A Preferred in an amount equal to the dividend per share that such holders would have received had they converted their shares of Series A Preferred into shares of Common Stock immediately prior to the record date for the declaration of the Common Stock dividend in an amount equal to the average VWAP during the 5 trading days prior to the date such dividend is due.

Warrants

Warrants to subscribe for and purchase up to 3,000,000 shares of common stock at an exercise price of $0.052 per share were included under the terms of the DAF Credit Agreement. The warrants will be issued in amounts of 150,000 and 210,000 per month during the funding period. In the event that funding advances deviate from the planned schedule then warrants will be issued pro-rata at 1.2 warrants for every $1 of funding. Warrants granted under the terms of the DAF Credit Agreement as of December 31, 2022 and 2021 total 2,814,000 and 2,604,000, respectively. The estimated value of the warrants granted monthly, with each advance, is calculated using the Black-Scholes option pricing model. The expected dividend yield is based on the average annual dividend yield as of the grant date. Expected volatility is based on the historical volatility of our stock. The risk-free interest rate is based on the U.S. Treasury Constant Maturity rates as of the grant date. The expected life of the warrant is based on historical exercise behavior and expected future experience. The resulting estimated value of the warrant is used to proportionally allocate the fair value of the debt advance and the fair value of the warrants.

On March 2, 2021, the Company entered into the Purchase Agreement with a single institutional investor in a private placement to sell (i) 23,500,000 shares of its common stock, (ii) pre-funded warrants to purchase up to an aggregate of 51,500,000 shares of its common stock, and (iii) warrants to purchase up to an aggregate of 82,500,000 shares of its common stock for gross proceeds of approximately $6,000,000. The combined purchase price for one share of common stock and associated Warrant is $0.08 and for one Pre-Funded Warrant and associated Warrant is $0.0799. The sale of the securities under the Purchase Agreement closed on March 5, 2021. The pre-funded warrants have an exercise price of $0.0001 per share, subject to adjustment as set forth in the pre-funded warrants for stock splits, stock dividends, recapitalizations and similar events. The pre-funded warrants will be exercisable immediately and may be exercised at any time until all of the pre-funded warrants are exercised in full. In addition, the Company agreed to issue to the placement agent (or its designees) warrants to purchase a number of shares equal to 8.0% of the aggregate number of shares and pre-funded warrant shares sold under the Purchase Agreement, or warrants to purchase an aggregate of up to 6,000,000 shares. The placement agent warrants generally will have the same terms as the warrants, except they will have an exercise price of $0.10.

Warrants Summary

The following table summarizes the Company’s warrant activity during the year ended December 31, 2022:

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number of			Exercise		Life		Intrinsic
	Warrants			Price		In Years		Value

Outstanding, December 31, 2021		142,604,000		$	0.0515
Granted		210,000			0.0520
Exercised		(10,300,000	)		0.0001
Outstanding, December 31, 2022		132,514,000		$	0.0555		3.63	$	1,745,850

Options

Stock options for employees, directors or consultants, are valued at the date of award, which does not precede the approval date, and compensation cost is recognized in the period the options are vested. The Company recognizes compensation expense for awards subject to graded vesting on a straight-line basis. Stock options generally become exercisable on the date of grant and expire based on the terms of each grant.

The estimated fair value of options for common stock granted was determined using the Black-Scholes option pricing model. The expected dividend yield is based on the average annual dividend yield as of the grant date. Expected volatility is based on the historical volatility of our stock. The risk-free interest rate is based on the U.S. Treasury Constant Maturity rates as of the grant date. The expected life of the option is based on historical exercise behavior and expected future experience.

On June 8, 2020, the Board of Directors consented to a share exchange agreement with holders of 21,500,000 options awarded on August 7, 2019. The agreement allows for holders to exchange their options for rule 144 common stock at an exchange rate of 0.6 shares per 1 option. The modification of these options did not result in any additional compensation because there was no change in the fair value. As of December 31, 2022, 9,500,000 options had been exchanged for 5,700,000 shares of common stock.

On September 30, 2021, the Board of Directors of the Company consented to cancelling and reissuance of 23,000,000 options, previously issued during the year 2021, in an effort to incentivize management, employees, and consultants of the Company. The options issued on September 30, 2021 have an exercise price of the $0.105 and vest immediately.

On March 23, 2022, the Board of Directors of the Company consented to granting 950,000 options to new employee and a consultant. These options have an exercise price of the $0.055 and vest immediately.

On October 14, 2022, the Company granted options to purchase a total of 24,000,000 shares of the Company’s common stock at an exercise price of $0.0277 per share. The options are exercisable for a period of five years from the date of issuance and vest immediately. Of the 24,000,000 total options granted, (i) options to purchase 3,000,000 shares of common stock were granted to Victor Keen, the Company’s co-chairman; (ii) options to purchase 3,000,000 shares of common stock were issued to Simon Calton, the Company’s co-chairman; (iii) options to purchase 7,000,000 shares of common stock were issued to Matthew Kappers, the Company’s Chief Executive Officer and Director; (iv) options to purchase 5,000,000 shares of common stock were issued to Matthew Hoffman, the Company’s Chief Financial Officer; and (vi) options to purchase an aggregate of 6,000,000 shares of common stock were issued to various employees and consultants of the Company.

The Company recognized $761,695 and $4,599,391 of stock option expense during the years ended December 31, 2022 and 2021, respectively.

Options Summary

The following table summarizes the Company’s option activity during the years ended December 31, 2022 and 2021:

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number of			Exercise		Life		Intrinsic
	Options			Price		In Years		Value

Outstanding, December 31, 2020		20,212,174		$	0.068
Expired		(565	)		420.000
Exchanged for common stock		(5,000,000	)		0.041
Granted		38,500,000			0.105
Outstanding, December 31, 2021		53,711,609			0.093		4.17	$	936,000
Options granted		24,950,000			0.028
Options expired		(3,449	)		70.260
Exchanged for common stock		(1,500,000	)		0.041
Outstanding, December 31, 2022		77,158,160		$	0.070		3.72	$	151,200

Exercisable options
Exercisable, December 31, 2021		53,461,609		$	0.093		4.17	$	916,000
Exercisable, December 31, 2022		77,158,160		$	0.070		3.72	$	151,200

The following table summarizes the Company’s options as of December 31, 2022:

				Weighted
		Outstanding		Average		Exercisable
Exercise		Number of		Remaining Life		Number of
Price		Options		In Years		Options

$	0.028		24,000,000		4.79		24,000,000
$	0.041		12,500,000		1.60		12,500,000
$	0.055		950,000		4.23		950,000
$	0.065		1,000,000		2.50		1,000,000
$	0.105		38,500,000		3.75		38,500,000
$	0.240		208,160		4.21		208,160
Total			77,158,160		3.72		77,158,160

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Note 7 - Commitments

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

Note 7 – Commitments

North Dakota State University Sponsored Research Agreement

The Company entered into a Sponsored Research Agreement (“SRA”) dated August 14, 2015 with North Dakota State University Research Foundation (“NDSU/RF”). With the proposed research for this project, NDSU/RF planned to make prototypical compounds and materials from CHS and CHS derivatives with the potential; 1) to act as efficient photoactive materials for solar cells, 2) to serve in electro active devices for optimization of current and voltage performance, 3) to perform at high levels of efficiency as silicon anodes in lightweight batteries (silicon has more than 11 times the capacity of carbon in the ubiquitous carbon based batteries), and, 4) to be incorporated into specialty inks for printed electronics applications. The research was conducted August 14, 2015 through August 31, 2016. The Company agreed to reimburse NDSU/RF for all costs incurred in performing the research up to a maximum amount of $70,000. On June 7, 2016 the Company and NDSU/RF mutually agreed to amend the SRA. Under the terms of the amendment the term was extended to June 30, 2017 and the consideration was increased by $120,000 to a maximum amount of $190,000.

As of December 31, 2022, the remaining balance of the SRA to be paid under the terms of the agreement is $93,578. As of December 31, 2022, and pursuant to the SRA, Coretec was in arrears on the payment of that obligation. Accordingly, as of December 31, 2022, Coretec would be considered in default under the SRA because of the unpaid obligations, which could allow NDSU/RF to exercise various options under the SRA, including an option to terminate the SRA if Coretec does not cure the default within 10 business days after receiving written notice by NDSU/RF. Due to Coretec’s belief that certain obligations of NDSU/RF were unsatisfied, Coretec has actively communicated with NDSU/RF in order to determine what obligations are owed and what actions all parties are required to take, and will agree to take, in furtherance of the SRA. In connection with such objective, Coretec has sent NDSU/RF a detailed communication setting forth, among other things, the basis for its belief that (i) the payment obligation was not due to NDSU/RF; and (ii) NDSU/RF does not have the right to enforce a default. Coretec did not attempt communication or receive communication from NDSU/RF during the year ended December 31, 2022.

As of the date of this report, there have been no legal proceedings initiated in connection with the SRA. However, no assurances can be made that the prior communications between the parties will result in a resolution or that legal proceedings will not be initiated in the future.

Real property leases

On June 30, 2020, the Company moved headquarters from Tulsa, Oklahoma to Ann Arbor, Michigan at which time the Company terminated the lease agreement in Tulsa. The Company continued to occupy the office space in Ann Arbor under the lease agreement that was executed on December 3, 2019. The Company signed a one-year lease in Ann Arbor, Michigan commencing January 1, 2020, with an annual rent obligation of $15,120 ($1,260 per month). The Company renewed the Ann Arbor lease for 2021 under the same terms. On September 30, 2021, the Company received $45,000 to vacate the leased space and assign the lease to a third party, which is recorded as other income in the consolidated statements of operations. The Company then leased office space in Ann Arbor on a month-to-month basis at a rate of $800 per month through April 30, 2022. On May 1, 2022, the Company entered into an annual lease for dedicated office space. The annual office rent obligation is $42,000 payable in equal monthly installments.

On December 14, 2021, the Company entered into an annual lease of a wet laboratory in the same facility as the Company’s office headquarters. The annual rent obligation is $12,600 payable in equal monthly installments. The Company took possession of the space in March of 2022. On January 1, 2023, the company renewed the wet laboratory lease for the 2023 calendar year under the same terms.

Rent expense for the office operating leases was $41,175 and $13,740 for the years ended December 31, 2022 and 2021, respectively.

Note 8 - Related Party Transactions

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Note 8 – Related Party Transactions

On June 21, 2021, the Company announced the appointment of Matthew J. Kappers as Chief Executive Officer. The agreement between Mr. Kappers and the Company stated that Mr. Kappers will operate in the CEO role as an independent contractor for the period of June 15, 2021 through December 15, 2021. Mr. Kappers will be compensated at a monthly rate of $12,500 and received an option grant to purchase 5,000,000 shares of common stock. The options were fully vested pursuant to the Board of Directors consent, effective September 30, 2021. Since December 2021, the Company and Mr. Kappers have been operating under the agreement on a month to month basis. The Company recognized $154,200 of expense as CEO for the year ended December 31, 2022 and $87,500 of consulting expense to Mr. Kappers as CEO and $23,884 for consulting related to markets and financing for the year ended December 31, 2021.

The Company entered into a one-year consulting agreement with Matthew Hoffman, doing business as Integrate Growth, LLC, effective May 18, 2020 and expiring May 19, 2021. Under the terms of the agreement, Hoffman had the position of Director of Finance. On June 30, 2020 Ron Robinson, Chief Financial Officer and Judith Keating, Corporate Secretary both retired from the Company. As part of the management transition plan Hoffman was elevated to Chief Financial Officer and Corporate Secretary on June 30, 2020. On June 23, 2021, the Company renewed the CFO and Corporate Secretary contract with Matthew L. Hoffman under similar terms of the initial contract through May 31, 2022. Mr. Hoffman and the Company operated on a month to month basis from June 1, 2022 through October 17, 2022. On October 18, 2022 the Company announced the appointment as COO, where the Company entered into an employment agreement with Mr. Hoffman. Pursuant to the Employment Agreement, Mr. Hoffman will receive an annual base salary of $200,000. Mr. Hoffman will also be eligible for an annual incentive bonus, with a target payout of twenty percent (20%) of his then-current base salary, beginning with the Company’s 2023 fiscal year, upon meeting objectives set by the board of directors. The Employment Agreement further provides that upon execution of the Employment Agreement, the Company will grant to Mr. Hoffman options to purchase 5,000,000 fully vested shares of the Company’s common stock. During the years ended December 31, 2022 and 2021, the Company recognized $103,050 and $103,950 of expenses, respectively, under the terms of the agreement of the consulting agreement and $50,000 of employee wage expense during the year ended December 31, 2022.

The Company entered into a consulting agreement dated March 20, 2017 with Michael A. Kraft, who became the Company’s CEO. Under the terms of the agreement the Company agreed to compensate Kraft, $1,500 per day for his commitment to allocate seven days a month (subsequently amended to ten day a month) to the Company and a $25,000 bonus payable in the Company’s restricted stock upon occurrence of certain events. Kraft was issued ten million options during August 2019 for (1) as compensation for the $25,000 bonus in the consulting agreement, (2) approximately $91,000 as payment for unpaid consulting fees and, (3) approximately $294,000 as additional compensation for his consulting services. All past accounts payable amounts were paid in full to Kraft in 2021. On June 21, 2021, Kraft transitioned from CEO to President with the appointment of Matthew Kappers to the role of CEO. On November 1, 2021 Kraft’s agreement was adjusted to an hourly rate of $187 per hour. During the years ended December 31, 2022 and 2021, the Company recognized $38,571 and $181,874 of expense respectively, under the terms of the agreement. Mr. Kraft resigned from as President of the Company with effect on October 17, 2022, his consulting agreement was since terminated.

Note 9 - Subsequent Events

12 Months Ended

Dec. 31, 2022

Notes to Financial Statements

Subsequent Events [Text Block]

Note 9 – Subsequent Events

On January 12, 2023, Douglas Freitag resigned as a member of the Board of Directors of The Coretec Group Inc. (the “Company”). Mr. Freitag will continue to support and advise the Company in the capacity of senior consultant. Mr. Freitag’s resignation was not as a result of any disagreements with the Company’s board of directors or management, but to allow him for sufficient time to commit to his primary business.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Nature of Business [Policy Text Block]

Nature of BusinessThe Coretec Group Inc. (the “Group”) (formerly 3DIcon Corporation) (“3DIcon”) was incorporated on August 11, 1995, under the laws of the State of Oklahoma as First Keating Corporation. The articles of incorporation were amended August 1, 2003 to change the name to 3DIcon Corporation. During 2001, First Keating Corporation began to focus on the development of 360-degree holographic technology. From January 1, 2001, 3DIcon’s primary activity has been the raising of capital in order to pursue its goal of becoming a significant participant in the development, commercialization and marketing of next generation 3D display technologies.Coretec Industries, LLC (“Coretec”), is a wholly owned subsidiary of the Group (collectively the “Company”). The Company is currently developing, testing, and providing new and/or improved technologies, products, and service solutions for energy-related industries including, but not limited to oil/gas, renewable energy, and distributed energy industries. Many of these technologies and products also have application for medical, electronic, photonic, display, and lighting markets among others. Early adoption of these technologies and products is anticipated in markets for energy storage (Li-ion batteries), renewable energy (BIPV), and electronics (Asset Monitoring).

Business Combinations Policy [Policy Text Block]

Reverse AcquisitionOn May 31, 2016, the Group entered into a Share Exchange Agreement (the “Share Exchange Agreement”) with Coretec and four Coretec members (the “Members”), which Members held all outstanding membership interests in Coretec. On September 30, 2016 (the “Closing Date”), the Group closed the transaction contemplated by the Share Exchange Agreement. Pursuant to the Share Exchange Agreement, the Members agreed to sell all their membership interests in Coretec to the Group in exchange for the Group’s issuance of an aggregate 4,760,872 shares of the Group’s Series B Convertible Preferred Stock to the Members (the “Exchange”). Coretec became a wholly owned subsidiary of the Group and the former Members beneficially owned approximately 65% of the Group’s common stock on a fully diluted basis on the Closing Date. Upon the closing of the Share Exchange Agreement, two of the Group’s Directors resigned and three new Directors associated with Coretec were nominated and elected, giving control of the board of directors to former Coretec Members.

Basis of Accounting, Policy [Policy Text Block]

Basis of PresentationUnder accounting principles generally accepted in the United States of America (“U.S. GAAP”), the acquisition is treated as a “reverse acquisition” under the purchase method of accounting. The consolidated statements of operations herein reflect the historical results of Coretec prior to the completion of the reverse acquisition since it was determined to be the accounting acquirer, and do not include the historical results of operations for 3DIcon prior to the completion of the acquisition. 3DIcon’s assets and liabilities were consolidated with the assets and liabilities of Coretec as of the September 30, 2016 consummation of the acquisition.

Consolidation, Policy [Policy Text Block]

Principles of ConsolidationThe consolidated financial statements include the accounts of the Group and its wholly owned subsidiary, Coretec. Intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates, Policy [Policy Text Block]

Use of EstimatesThe preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and the disclosure of contingent assets and liabilities. Actual results could differ from the estimates and assumptions used.

Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]

IntangiblesIntangible assets consist of purchased patents and capitalized website costs. Intangible assets are recorded at the fair value as of the date of acquisition, and intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives.

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill Goodwill was acquired with the reverse acquisition. The Company evaluates the carrying value of goodwill on an annual basis and if events occur or circumstances change that would more likely than not reduce the fair value of goodwill below its carrying amount. When assessing whether goodwill is impaired, management considers first a qualitative approach to evaluate whether it is more likely than not the fair value of the goodwill is below its carrying amount; if so, management considers a quantitative approach by analyzing changes in performance and market-based metrics as compared to those used at the time of the initial acquisition. For the periods presented, no impairment charges were recognized.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and EquipmentProperty and equipment are recorded at cost. Depreciation is recorded over the estimated useful lives using the straight-line method. Maintenance and repairs are expensed as incurred; major improvements and betterments are capitalized.Estimated useful lives of property and equipment are as follows for the major classes of assets:

Asset Description	Estimated Lives (years)
Furniture and fixtures		7
Equipment		7

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Impairment of Long-Lived Assets Long-lived assets, such as intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, impairment is recognized to the extent that the carrying value exceeds its fair value. Fair value is determined through various valuation techniques including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial InstrumentsThe following methods and assumptions were used to estimate the fair value of each class of financial instrument held by the Company:Current assets and current liabilities - The carrying value approximates fair value due to the short maturity of these items.Notes payable - The fair value of the Company's notes payable has been estimated by the Company based upon the liability's characteristics, including interest rates, embedded instruments and conversion discounts. The carrying value approximates fair value after taking into consideration the liability’s characteristics.

Earnings Per Share, Policy [Policy Text Block]

Basic and Diluted Loss Per Common ShareBasic loss per common share is computed by dividing net loss by the weighted average number of vested common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other instruments to issue common stock were exercised or converted into common stock. The following securities are excluded from the calculation of weighted average dilutive common shares because their inclusion would have been anti-dilutive:

	December 31,
	2022		2021
Options		77,158,160		53,711,609
Warrants		132,514,000		142,604,000
Series A convertible preferred stock		115,000		115,000
Convertible debt		45,155,537		39,836,388
Total potentially dilutive shares		254,942,697		236,266,997

Research and Development Expense, Policy [Policy Text Block]

Research and DevelopmentResearch and development costs are expensed as incurred.

Income Tax, Policy [Policy Text Block]

Income TaxesThe Company accounts for income taxes under an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s consolidated financial statements or tax returns. In estimating future tax consequences, the Company generally considers all expected future events other than enactments of changes in tax laws or rates. The effect on deferred tax assets and liabilities of a change in tax rates will be recognized as income or expense in the period that includes the enactment date. A valuation allowance is established when necessary to reduce deferred tax assets to the amount expected to be realized.The Company’s tax benefits are fully offset by a valuation allowance due to the uncertainty that the deferred tax assets would be realized. Management considers the likelihood of changes by taxing authorities in its filed income tax returns and recognizes a liability for or discloses potential changes that management believes are more likely than not to occur upon examination by tax authorities. Management has not identified any uncertain tax positions in filed income tax returns that require recognition or disclosure in the accompanying consolidated financial statements.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting PronouncementsThe following is a summary of recent accounting pronouncement recently adopted by the Company: In August 2020, the FASB issued ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40). This ASU simplifies the accounting for convertible instruments. The guidance removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments. As a result, after adopting ASU 2020-06, the Company will no longer separately present the embedded conversion feature of its convertible debt within stockholders’ equity and interest expense is expected to decrease due to the elimination of the related debt discount amortization. The Company adopted ASU 2020-06 under the modified retrospective approach effective January 1, 2021.The cumulative impact of using the modified retrospective approach for the adoption of ASU 2020-06 on our consolidated balance sheet as of January 1, 2021 is summarized below:

	Balance at December 31, 2020			Impact of ASU 2020-06			Balance with Adoption of ASU 2020-06
Liabilities
Long-term debt, net	$	266,598		$	862,775		$	1,129,373
Equity
Additional paid-in-capital	$	8,033,313		$	(988,900	)	$	7,044,413
Accumulated deficit	$	(7,339,175	)	$	126,125		$	(7,213,050	)

Note 1 - Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Property Plant and Equipment, Estimated Useful Lives [Table Text Block]

Asset Description	Estimated Lives (years)
Furniture and fixtures		7
Equipment		7

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	December 31,
	2022		2021
Options		77,158,160		53,711,609
Warrants		132,514,000		142,604,000
Series A convertible preferred stock		115,000		115,000
Convertible debt		45,155,537		39,836,388
Total potentially dilutive shares		254,942,697		236,266,997

Accounting Standards Update and Change in Accounting Principle [Table Text Block]

	Balance at December 31, 2020			Impact of ASU 2020-06			Balance with Adoption of ASU 2020-06
Liabilities
Long-term debt, net	$	266,598		$	862,775		$	1,129,373
Equity
Additional paid-in-capital	$	8,033,313		$	(988,900	)	$	7,044,413
Accumulated deficit	$	(7,339,175	)	$	126,125		$	(7,213,050	)

Note 3 - Intangibles (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	December 31,			December 31,
Patents	2022			2021
Gross carrying amount	$	1,400,000		$	1,400,000
Accumulated amortization		(501,433	)		(421,203	)
	$	898,567		$	978,797

Note 4 - Debt (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Long-Term Debt Instruments [Table Text Block]

	December 31,			December 31,
	2022			2021
Notes payable:
5.26% Insurance premium finance agreement due June 2023	$	61,398		$	-
Notes payable - current	$	61,398		$	-


Long term debt:
10% Promissory note due January 2024	$	1,485,617		$	1,310,617
Less:
Warrants issued		(51,755	)		(93,928	)
Debt issue costs		(19,036	)		(29,171	)
Total long term debt	$	1,414,826		$	1,187,518

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.12-04(a))
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-Topic 835
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21538-112644

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Note 6 - Common Stock, Preferred Stock, Warrants and Options (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Warrant Activity [Table Text Block]

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number of			Exercise		Life		Intrinsic
	Warrants			Price		In Years		Value

Outstanding, December 31, 2021		142,604,000		$	0.0515
Granted		210,000			0.0520
Exercised		(10,300,000	)		0.0001
Outstanding, December 31, 2022		132,514,000		$	0.0555		3.63	$	1,745,850

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number of			Exercise		Life		Intrinsic
	Options			Price		In Years		Value

Outstanding, December 31, 2020		20,212,174		$	0.068
Expired		(565	)		420.000
Exchanged for common stock		(5,000,000	)		0.041
Granted		38,500,000			0.105
Outstanding, December 31, 2021		53,711,609			0.093		4.17	$	936,000
Options granted		24,950,000			0.028
Options expired		(3,449	)		70.260
Exchanged for common stock		(1,500,000	)		0.041
Outstanding, December 31, 2022		77,158,160		$	0.070		3.72	$	151,200

Exercisable options
Exercisable, December 31, 2021		53,461,609		$	0.093		4.17	$	916,000
Exercisable, December 31, 2022		77,158,160		$	0.070		3.72	$	151,200

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

				Weighted
		Outstanding		Average		Exercisable
Exercise		Number of		Remaining Life		Number of
Price		Options		In Years		Options

$	0.028		24,000,000		4.79		24,000,000
$	0.041		12,500,000		1.60		12,500,000
$	0.055		950,000		4.23		950,000
$	0.065		1,000,000		2.50		1,000,000
$	0.105		38,500,000		3.75		38,500,000
$	0.240		208,160		4.21		208,160
Total			77,158,160		3.72		77,158,160

Note 1 - Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Sep. 30, 2016	Dec. 31, 2022	Dec. 31, 2021
Goodwill, Impairment Loss		$ 0	$ 0
Series B Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)	4,760,872
Sale of Stock, Percentage of Ownership after Transaction	65.00%

Note 1 - Business and Summary of Significant Accounting Policies  (Details)	12 Months Ended
	Dec. 31, 2022
Furniture and Fixtures [Member]
Useful life (Year)	7 years
Equipment [Member]
Useful life (Year)	7 years

Note 1 - Business and Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Potentially dilutive shares (in shares)	254,942,697	236,266,997
Options [Member]
Potentially dilutive shares (in shares)	77,158,160	53,711,609
Warrant [Member]
Potentially dilutive shares (in shares)	132,514,000	142,604,000
Series A Convertible Preferred Stock [Member]
Potentially dilutive shares (in shares)	115,000	115,000
Convertible Debt Securities [Member]
Potentially dilutive shares (in shares)	45,155,537	39,836,388

Note 1 - Business and Summary of Significant Accounting Policies - Cumulative Impact of Using Modified Retrospective Approach for Adoption of ASU (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Long-term debt, net				$ 266,598
Additional paid-in capital	$ 18,119,792	$ 17,295,262		8,033,313
Accumulated deficit	$ (16,345,313)	$ (13,481,989)		(7,339,175)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Long-term debt, net				862,775
Additional paid-in capital				(988,900)
Accumulated deficit				$ 126,125
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Long-term debt, net			$ 1,129,373
Additional paid-in capital			7,044,413
Accumulated deficit			$ (7,213,050)

Note 2 - Recent Capital Financing and Management's Plans (Details Textual)	Mar. 02, 2021 USD ($) $ / shares shares
Pre-funded Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	51,500,000
Class of Warrant or Right, Purchase Price of Warrants or Rights \| $ / shares	$ 0.08
Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	82,500,000
Class of Warrant or Right, Purchase Price of Warrants or Rights \| $ / shares	$ 0.0799
Private Placement [Member]
Stock Issued During Period, Shares, New Issues	23,500,000
Proceeds from Issuance or Sale of Equity, Total \| $	$ 6,000,000

Note 3 - Intangibles (Details Textual) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Net, Ending Balance	$ 906,975	$ 989,604
Patents [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year Three	80,000
Finite-Lived Intangible Asset, Expected Amortization, Year One	80,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	80,000
Finite-Lived Intangible Asset, Expected Amortization, Year Four	80,000
Finite-Lived Intangible Asset, Expected Amortization, Year Five	80,000
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	80,000
Finite-Lived Intangible Assets, Net, Ending Balance	898,567	978,797
Finite-Lived Intangible Assets, Accumulated Amortization	501,433	421,203
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year Three	2,400
Finite-Lived Intangible Asset, Expected Amortization, Year One	2,400
Finite-Lived Intangible Asset, Expected Amortization, Year Two	2,400
Finite-Lived Intangible Asset, Expected Amortization, Year Four	2,400
Finite-Lived Intangible Asset, Expected Amortization, Year Five	2,400
Finite-Lived Intangible Assets, Net, Ending Balance		12,007
Finite-Lived Intangible Assets, Accumulated Amortization	$ 2,400	$ 1,200

Note 3 - Intangibles - Schedule of Patents (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Net, Ending Balance	$ 906,975	$ 989,604
Patents [Member]
Gross carrying amount	1,400,000	1,400,000
Accumulated amortization	(501,433)	(421,203)
Finite-Lived Intangible Assets, Net, Ending Balance	$ 898,567	$ 978,797

Note 4 - Debt (Details Textual)							1 Months Ended	12 Months Ended
Note 4 - Debt (Details Textual)	Jul. 15, 2022 USD ($)	Oct. 27, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Apr. 29, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Oct. 04, 2019 USD ($) $ / shares shares	Aug. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares								$ 0.0555	$ 0.0515
Additional Paid in Capital, Total								$ (18,119,792)	$ (17,295,262)		$ (8,033,313)
Retained Earnings (Accumulated Deficit), Total								16,345,313	13,481,989		$ 7,339,175
Amortization Associated With Commitment Fee								15,385	14,125
Conversion of DAF Promissory Note into Common Stock [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share) \| $ / shares		$ 0.0329		$ 0.0329	$ 0.0329
Debt Conversion, Original Debt, Amount		$ 35,458		$ 180,000	$ 50,000
Debt Conversion, Converted Instrument, Shares Issued \| shares		1,077,746		5,471,125	1,519,757
Amortization of Debt Issuance Costs		$ 1,523		$ 3,772	$ 1,346
DAF Credit Agreement Conversion Related Warrants [Member]
Interest Expense, Debt, Total		5,850		16,429	5,513
Interest Expense, Debt, Total		$ (5,850)		$ (16,429)	$ (5,513)
Accounting Standards Update 2020-06 [Member]
Additional Paid in Capital, Total										$ 989,000
Long-Term Debt, Total										863,000
Retained Earnings (Accumulated Deficit), Total										$ 126,000
Warrant Issued in Connection With Credit Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights \| shares						3,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares						$ 0.052
Allocated Cost of Warrants									62,784
Amortization Expense Associated With Warrants								$ 46,275	$ 47,230
Insurance Financing Agreement [Member]
Interest rate								5.26%
Debt Instrument, Face Amount								$ 101,444
Debt Instrument, Periodic Payment, Total							$ 10,391
Debt Instrument, Face Amount								$ (101,444)
Three Point Eight Percent Insurance Premium Finance Agreement [Member]
Debt Instrument, Term (Year)								10 years
Credit Agreement And Note [Member]
Interest rate						10.00%		10.00%	10.00%
Debt Agreement, Maximum Borrowing Capacity						$ 2,500,000
Debt Instrument, Number of Tranches						16
Proceeds from Notes Payable, Total	$ 175,000							$ 2,345,000
Debt Instrument, Notes Payable, Portion Not Advanced								155,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger						70.00%
Debt Instrument, Convertible, Threshold Trading Days						15
Debt Instrument, Convertible, Conversion Price (in dollars per share) \| $ / shares						$ 0.0329
Debt Instrument, Unamortized Discount, Total						$ 862,775
Line of Credit Facility, Commitment Fee Percentage						3.00%
Line of Credit Facility, Commitment Fee and Debt-related Expenses to Be Amortized								5,250	$ 10,350
Credit Agreement And Note [Member] \| Minimum [Member]
Debt Instrument, Amount Funded in Each Monthly Tranche						$ 125,000
Credit Agreement And Note [Member] \| Maximum [Member]
Debt Instrument, Amount Funded in Each Monthly Tranche						$ 175,000
Warrant Issued in Connection With Credit Agreement [Member]
Allocated Cost of Warrants								4,102
DAF Credit Agreement [Member]
Debt Instrument, Face Amount			$ 43,925
Interest Expense, Debt, Total			58,681
Repayments of Long-Term Debt, Total			102,606
Debt Instrument, Face Amount			(43,925)
Interest Expense, Debt, Total			$ (58,681)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total								$ 131,357	$ 30,572

Note 4 - Debt - Schedule of Debt (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Notes payable	$ 61,398	$ 0
Total long term debt	1,414,826	1,187,518
Insurance Financing Agreement [Member]
Notes payable	61,398	0
Credit Agreement And Note [Member]
10% Promissory note due January 2024	1,485,617	1,310,617
Warrants issued	(51,755)	(93,928)
Debt issue costs	$ (19,036)	$ (29,171)

Note 4 - Debt - Schedule of Debt (Details) (Parentheticals)	Dec. 31, 2022	Dec. 31, 2021	Oct. 04, 2019
Insurance Financing Agreement [Member]
Interest rate	5.26%
Credit Agreement And Note [Member]
Interest rate	10.00%	10.00%	10.00%

Note 5 - Equity Incentive Plans (Details Textual) - shares	Sep. 30, 2021	Dec. 31, 2022	Jan. 31, 2018
2018 EIP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized			15,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant		2,682,830
Equity Incentive Plan 2021 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant		50,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period	62,000,000

Note 6 - Common Stock, Preferred Stock, Warrants and Options (Details Textual)										12 Months Ended		31 Months Ended
	Oct. 14, 2022 $ / shares shares	Mar. 23, 2022 $ / shares shares	Sep. 30, 2021 $ / shares shares	Mar. 02, 2021 USD ($) $ / shares shares	Oct. 22, 2020	Jun. 08, 2020 shares	Oct. 04, 2019 $ / shares shares	Aug. 07, 2019 shares	Dec. 11, 2013 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2022 $ / shares shares
Share Exchange Agreement, Number of Options Authorized						21,500,000
Share Exchange Agreement, Exchange Ratio						0.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchanged										1,500,000	5,000,000	9,500,000
Stock Issued During Period, Shares, Stock Options Exchanged for Common Shares										900,000	3,000,000	5,700,000
Preferred stock, shares authorized (in shares)										500,000	500,000	500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares										$ 0.0555	$ 0.0515	$ 0.0555
Class of Warrant or Right, Issued Monthly										210,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	24,000,000							21,500,000
Stock Cancelled and Reissued During Period			23,000,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares	$ 0.0277		$ 0.105
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period	5 years
Share-Based Payment Arrangement, Expense \| $										$ 761,695	$ 4,599,391
Employees and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	6,000,000	950,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares		$ 0.055
Co-chairman [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	3,000,000
Co-chairman 2 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	3,000,000
Chief Executive Officer and Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	7,000,000
Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	5,000,000
Private Placement [Member]
Stock Issued During Period, Shares, New Issues				23,500,000
Proceeds from Issuance or Sale of Equity, Total \| $				$ 6,000,000
Warrant Issued in Connection With Credit Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							3,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 0.052
Class of Warrant or Right, Number of Warrants Issued Per Dollar in the Event of Funding Deviation							1.2
Class of Warrant or Right, Issued During Period										2,814,000	2,604,000
Warrant Issued in Connection With Credit Agreement [Member] \| Minimum [Member]
Class of Warrant or Right, Issued Monthly							150,000
Warrant Issued in Connection With Credit Agreement [Member] \| Maximum [Member]
Class of Warrant or Right, Issued Monthly							210,000
Pre-funded Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				51,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares				$ 0.0001
Class of Warrant or Right, Purchase Price of Warrants or Rights \| $ / shares				$ 0.08
Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				82,500,000
Class of Warrant or Right, Purchase Price of Warrants or Rights \| $ / shares				$ 0.0799
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				6,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares				$ 0.10
Warrants Ownership Percentage, Maximum Limit				8.00%
S8 Common Stock [Member]
Common Stock Issued to Satisfy Accrued Liabilities, Number of Trading Days Over which Average Closing Price is Used to Determine Number of Shares					15
Common Stock Issued to Satisfy Accrued Liabilities, Discount Rate Used to Determine Number of Shares					50.00%
Stock Issued During Period, Shares, Satisfaction of Vendor Accrued Liabilities and Services										3,615,621	5,735,808
Stock Issued During Period, Value, Satisfaction of Vendor Accrued Liabilities and Services \| $										$ 60,666	$ 418,074
Series A Preferred Stock [Member]
Preferred stock, shares authorized (in shares)									500,000	500,000		500,000
Preferred Stock, Par Value, Per Share \| $ / shares									$ 0.0002
Preferred Stock, Stated Value, Per Share \| $ / shares									$ 1.00
Preferred Stock, Dividend Rate, Percentage									6.00%
Preferred Stock, Amount of Preferred Dividends in Arrears \| $										$ 190,000	$ 169,000
Convertible Preferred Stock, Shares Issued upon Conversion										166,667		166,667
Convertible Preferred Stock, Volume Weighted Average Price Trigger \| $ / shares										$ 15.00

Note 6 - Common Stock, Preferred Stock, Warrants and Options - Warrants (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Outstanding, number of warrants (in shares) \| shares	142,604,000
Outstanding, weighted-average exercise price (in dollars per share) \| $ / shares	$ 0.0515
Granted, number of warrants (in shares) \| shares	210,000
Granted, weighted-average exercise price (in dollars per share) \| $ / shares	$ 0.0520
Exercised, number of warrants (in shares) \| shares	(10,300,000)
Exercised, weighted-average exercise price (in dollars per share) \| $ / shares	$ 0.0001
Outstanding, number of warrants (in shares) \| shares	132,514,000
Outstanding, weighted-average exercise price (in dollars per share) \| $ / shares	$ 0.0555
Outstanding, weighted-average remaining life (Year)	3 years 7 months 17 days
Outstanding, aggregate intrinsic value \| $	$ 1,745,850

Note 6 - Common Stock, Preferred Stock, Warrants and Options - Option Activity (Details) - USD ($)				12 Months Ended		31 Months Ended
	Oct. 14, 2022	Sep. 30, 2021	Aug. 07, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022
Exchanged for common stock (in shares)				(1,500,000)	(5,000,000)	(9,500,000)
Granted, Shares (in shares)	24,000,000		21,500,000
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.0277	$ 0.105
Share-Based Payment Arrangement, Option [Member]
Outstanding, Shares (in shares)				53,711,609	20,212,174
Outstanding, Weighted Average Exercise Price (in dollars per share)				$ 0.093	$ 0.068
Expired, Shares (in shares)				(3,449)	(565)
Expired, Weighted Average Exercise Price (in dollars per share)				$ 70.260	$ 420.000
Exchanged for common stock (in shares)				(1,500,000)	(5,000,000)
Exchanged for common stock, Weighted Average Exercise Price (in dollars per share)				$ 0.041	$ 0.041
Granted, Shares (in shares)				24,950,000	38,500,000
Granted, Weighted Average Exercise Price (in dollars per share)				$ 0.028	$ 0.105
Outstanding, Weighted Average Remaining Life in Years (Year)				3 years 8 months 19 days	4 years 2 months 1 day
Outstanding, Aggregate intrinsic value				$ 151,200	$ 936,000	$ 151,200
Outstanding, Shares (in shares)				77,158,160	53,711,609	77,158,160
Outstanding, Weighted Average Exercise Price (in dollars per share)				$ 0.070	$ 0.093	$ 0.070
Exercisable, Shares (in shares)				77,158,160	53,461,609	77,158,160
Exercisable, Weighted Average Exercise Price (in dollars per share)				$ 0.070	$ 0.093	$ 0.070
Exercisable, Weighted Average Remaining Life (Year)				3 years 8 months 19 days	4 years 2 months 1 day
Exercisable, Aggregate intrinsic value				$ 151,200	$ 916,000	$ 151,200

Note 6 - Common Stock, Preferred Stock, Warrants and Options - Shares Authorized Under Stock Option Plans (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Option Outstanding, Number Of Options (in shares)	77,158,160
Option Exercisable, Weighted Average Remaining Life In Years (Year)	3 years 8 months 19 days
Option Exercisable, Number Of Options (in shares)	77,158,160
Exercise Price Range One [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.028
Option Outstanding, Number Of Options (in shares)	24,000,000
Option Exercisable, Weighted Average Remaining Life In Years (Year)	4 years 9 months 14 days
Option Exercisable, Number Of Options (in shares)	24,000,000
Exercise Price Range Two [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.041
Option Outstanding, Number Of Options (in shares)	12,500,000
Option Exercisable, Weighted Average Remaining Life In Years (Year)	1 year 7 months 6 days
Option Exercisable, Number Of Options (in shares)	12,500,000
Exercise Price Range Three [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.055
Option Outstanding, Number Of Options (in shares)	950,000
Option Exercisable, Weighted Average Remaining Life In Years (Year)	4 years 2 months 23 days
Option Exercisable, Number Of Options (in shares)	950,000
Exercise Price Range Four [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.065
Option Outstanding, Number Of Options (in shares)	1,000,000
Option Exercisable, Weighted Average Remaining Life In Years (Year)	2 years 6 months
Option Exercisable, Number Of Options (in shares)	1,000,000
Exercise Price Range Five [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.105
Option Outstanding, Number Of Options (in shares)	38,500,000
Option Exercisable, Weighted Average Remaining Life In Years (Year)	3 years 9 months
Option Exercisable, Number Of Options (in shares)	38,500,000
Exercise Price Range Six [Member]
Option Outstanding, Exercise Price (in dollars per share) \| $ / shares	$ 0.240
Option Outstanding, Number Of Options (in shares)	208,160
Option Exercisable, Weighted Average Remaining Life In Years (Year)	4 years 2 months 15 days
Option Exercisable, Number Of Options (in shares)	208,160

Note 7 - Commitments (Details Textual) - USD ($)					1 Months Ended	12 Months Ended
Note 7 - Commitments (Details Textual) - USD ($)	May 01, 2022	Apr. 30, 2022	Sep. 30, 2021	Jan. 01, 2020	Jun. 30, 2017	Dec. 31, 2022	Dec. 31, 2021	Aug. 01, 2016	Mar. 31, 2022
Operating Lease, Expense						$ 41,175	$ 13,740
Wet Laboratory in Office Headquarters [Member]
Lessee, Operating Lease, Liability, to be Paid, Total									$ 12,600
Ann Arbor, Michigan [Member]
Lessee, Operating Lease, Term of Contract						1 year
Lessee, Operating Lease, Liability, to be Paid, Total				$ 15,120
Operating Leases, Rent Expense, Monthly	$ 42,000	$ 800		$ 1,260
Operating Lease, Other Income			$ 45,000
North Dakota State University Research Foundation [Member]
Reimbursement of Cost Relating to Research, Remaining Balance						$ 93,578
North Dakota State University Research Foundation [Member]
Reimbursement of Cost Relating to Research, Maximum Amount					$ 190,000			$ 70,000
Increase in Reimbursement of Cost Relating to Research					$ 120,000

Note 8 - Related Party Transactions (Details Textual) - USD ($)								12 Months Ended
	Oct. 18, 2022	Oct. 14, 2022	Nov. 01, 2021	Jun. 21, 2021	May 21, 2020	Aug. 07, 2019	Mar. 20, 2017	Dec. 31, 2022	Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross		24,000,000				21,500,000
Matthew Kappers [Member]
Independent Contractor, Monthly Fee				$ 12,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross				5,000,000
Related Party Transaction, Expenses from Transactions with Related Party								$ 154,200
Matthew Kappers [Member] \| Consulting as Chief Executive Officer [Member]
Related Party Transaction, Expenses from Transactions with Related Party									$ 87,500
Matthew Kappers [Member] \| Consulting Related to Markets and Financing [Member]
Related Party Transaction, Expenses from Transactions with Related Party									23,884
Matthew Hoffman [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	5,000,000
Related Party Transaction, Expenses from Transactions with Related Party								103,050	103,950
Consulting Agreement, Term					1 year
Annual Base Salary	$ 200,000
Annual Incentive Bonus, Target Payout, Percentage of Base Salary	20.00%
Salary and Wage, Excluding Cost of Good and Service Sold, Total								50,000
Michael A. Kraft [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross						10,000,000
Related Party Transaction, Expenses from Transactions with Related Party								$ 38,571	$ 181,874
Consulting Fee Per Day							$ 1,500
Accrued Bonuses							$ 25,000
Contract Services, Hourly Rate			$ 187
Michael A. Kraft [Member] \| Options Issued for Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value						$ 25,000
Michael A. Kraft [Member] \| Options Issued for Accrued Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value						91,000
Michael A. Kraft [Member] \| Options Issued As Additional Compensation for CEO Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value						$ 294,000