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Note 6 - Convertible Debentures (Details Textual) |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) $ / shares shares | Jun. 26, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Sep. 24, 2020 $ / shares shares
Proceeds from Convertible Debt |  |  | $ 0 | $ 888,500 | $ 888,500 | $ 0 |
Number of Common Stock Securities Called by Each Unit (in shares) | shares | 1 |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  | $ 0 | $ 124,185 | $ 124,185 | $ 0 |
Conversion from Convertible Debentures to Conversion Units [Member] |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 4.00 |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 1,200,000 |  |  |  |  |  |
Debt Conversion, Accrued Interest Amount | $ 14,667 |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | 303,668 |  |  |  |  |  |
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche One [Member] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | 177,626 |  |  |  |  |  |
Number of Common Stock Securities Called by Each Unit (in shares) | shares | 1 |  |  |  |  |  |
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | 126,042 |  |  |  |  |  |
June 2020 Warrants [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  | 120,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.00 | $ 10.00 |  |  | $ 5.00 |  |
Warrants and Rights Outstanding |  | $ 457,833 |  |  |  |  |
Payments of Debt Issuance Costs |  | $ 161,500 |  |  |  |  |
Conversion Warrant [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares | 1 |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 250,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares | 1 |  |  |  |  |  | 1
Pre-Funded Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member] |  |  |  |  |  |  |
Number of Warrants Called by Each Unit (in shares) | shares | 1 |  |  |  |  |  |
Unit Warrants [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 2,560,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.00 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares | 1 |  |  |  |  |  |
Convertible Debentures [Member] |  |  |  |  |  |  |
Number of Institutional Investors |  | 2 |  |  |  |  |
Proceeds from Convertible Debt, Gross |  | $ 1,050,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,200,000 |  |  |  |  |
Proceeds from Convertible Debt |  | $ 888,500 |  |  |  |  |
Debt Instrument, Term (Year) |  | 12 months |  |  |  |  |
Gross Proceeds from Issuance of Common Stock, Public Offering |  | $ 6,000,000 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  | $ 10.00 |  |  |  |  |
Percentage of Offering Price |  | 80.00% |  |  |  |  |
Debt Instrument, Convertible, Maximum Allowed Ownership of Common Stock Outstanding, Percentage |  | 4.99% |  |  |  |  |
Debt Instrument, Unamortized Discount, Total | $ 645,150 | $ 769,334 |  |  |  |  |
Debt Conversion, Original Debt Discount |  | $ 150,000 |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  | $ 138,851 |  |
Amortization of Debt Discount (Premium) |  |  |  |  | $ 124,185 |  |

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