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Note 7 - PPP Loan (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 14, 2020 | Apr. 14, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Proceeds from Issuance of Long-term Debt, Total |  |  | $ 813,500 |
Paycheck Protection Program CARES Act [Member] |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  | $ 813,500 |  |
Debt Instrument, Decrease, Forgiveness | $ 813,500 |  |  |

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