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Note 7 - Notes Payable (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 17, 2020 | Feb. 28, 2018 | May 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Proceeds from Notes Payable, Total |  |  |  |  |  | $ 0 | $ 170,200 | $ 170,200 | $ 0
Repayments of Notes Payable |  |  |  |  |  | 27,864 | 8,854 | 11,880 | $ 10,257
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |
Proceeds from Notes Payable, Total | $ 170,200 |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  | $ 0 | $ 429 | 653 | 774 | $ 1,203 |
Extinguishment of Debt, Amount |  |  | $ 170,200 |  |  |  |  |  |
Gain (Loss) from Interest Forgiven |  |  | 1,856 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 5 years |  |  |  |  |  |  |
Proceeds from Notes Payable, Total |  | $ 50,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  | $ 0 | $ 411 | $ 633 | $ 1,344 |  |
Repayments of Notes Payable |  |  | $ 22,737 |  |  |  |  |  |

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