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Note 7 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2021 | Sep. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 28, 2021 | Jun. 01, 2021 | Sep. 24, 2020 | Jun. 26, 2020
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Gross |  | $ 12,800,000 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 11,200,000 |  |  |  |  |  |  |
Number of Common Stock Securities Called by Each Unit (in shares) |  | 1 |  |  |  |  |  |  |
Deferred Compensation Liability Conversion to Equity, Amount |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |  |
Deferred Compensation Liability Conversion to Equity, Conversion Price (in dollars per share) |  | $ 5 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Cancellation of Accrued Compensation (in shares) |  | 300,001 |  | 300,001 |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) |  | 177,626 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,644,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 10,300,000 |  | $ 9,408,920 | $ 11,158,496 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 9,400,000 |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 3,404,156 | $ 2,500 |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  | 13,707 | 26,581 |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  | 716,790 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  | 110.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 2.87 | $ 1.12 |  |  |  |  |
Prepaid Expense, Value of Stock Issued for Services During Period |  |  | $ 19,947 |  |  |  |  |  |
Expense Related To Consulting And Investment Banking Agreements [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 100,560 | $ 45,733 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 269,427 | $ 18,730 |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 1,420,144 |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 73 days |  |  |  |  |  |
Stock Incentive Plan 2020 [Member] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  | 1,500,000 |  |  |  |
Conversion of Series H, Series I, and Series J Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  | 716,790 |  |  |  |  |
Conversion from Convertible Debentures to Conversion Units [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Principal and Interest, Amount |  | $ 1,214,667 |  |  |  |  |  |  |
Conversion Warrants [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right, Issued During Period (in shares) |  | 2,560,000 |  |  |  |  |  |  |
Conversion Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) |  | 303,668 |  |  |  |  |  |  |
Unit Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 5 | $ 5 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 740,034 |  |  |  |  |  |
Proceeds from Warrant Exercises, Gross |  |  | $ 3,700,000 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 3,400,000 |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 27,004 |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  |  |  |
Pre-Funded Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) |  | 126,042 |  | 126,042 |  |  |  |  |
Management Warrant [Member] |  |  |  |  |  |  |  |  |
Number of Warrants Called by Each Unit (in shares) |  | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 300,001 |  |  |  |  |  |  |
Stock Purchase Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 215,672 | 54,557 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 149,705 | 36,902 |  |  |  |  |
June 2020 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 5 |  |  |  |  |  |  | $ 10
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  | 5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 120,000
Conversion of Convertible Debenture [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 303,668 |  |  |  |  |  |  |
Unit Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 2,560,000 |  |  |  |  |  |  |
Unit Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) |  |  |  | 303,668 |  |  |  |  |
Representative Warrants 2020 [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 5.5 |  |  |  |  | $ 5.50 |
Warrants and Rights Outstanding, Term (Year) |  | 3 years 180 days |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 128,000 |  |  |  |  |  |  |
Representative Warrants 2021 [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 6.875 |  | 6.875 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 3 years 180 days |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 72,000 |  |  |  |  |  |  |  |
Warrants 2021 [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 13 |  |  | $ 13 |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  | 5 years |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 100,000 |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  | 0 | 100 |  |  | 100 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 1,000 | $ 1,000 |  |  |  |  |
Capital Units Tranche One [Member] | Capital Units [Member] |  |  |  |  |  |  |  |  |
Number of Common Stock Securities Called by Each Unit (in shares) |  | 1 |  |  |  |  |  |  |

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