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Note 5 - Debt (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 01, 2021 | Jun. 26, 2020 | Apr. 17, 2020 | Feb. 28, 2018 | May 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Proceeds from Notes Payable, Total |  |  |  | $ 50,000 |  | $ 0 | $ 170,200
Repayments of Notes Payable |  |  |  |  |  | 27,864 | 11,880
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  | $ 172,056 | $ 0
Convertible Debentures [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,200,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 120,000 |  |  |  |  |
Proceeds from Convertible Debt, Gross |  | $ 1,050,000 |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |
Proceeds from Notes Payable, Total |  |  | $ 170,200 |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 170,200 |  |
Gain (Loss) from Interest Forgiven |  |  |  |  | 1,856 |  |
Gain (Loss) on Extinguishment of Debt, Total | $ 172,056 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  | 5 years |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.00% |  |  |
Repayments of Notes Payable |  |  |  |  | $ 22,737 |  |

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