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Note 8 - Note Payable (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 27, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Proceeds from Notes Payable, Total |  |  |  | $ 0 | $ 272,099
Gain (Loss) on Extinguishment of Debt, Total |  | $ 276,180 | $ 0 | $ 276,180 | $ 0
Paycheck Protection Program CARES Act [Member] |  |  |  |  |
Proceeds from Notes Payable, Total | $ 276,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  | $ 276,000 |  |  |

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