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Note 5 - Notes Payable (Details Textual) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 17, 2020 | Feb. 28, 2018 | 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
Interest Expense, Total |  |  | $ (0) | $ 134,427 | 1,286 | 142,722 | 143,524 | 4,495
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |
Proceeds from Notes Payable, Total | $ 170,200 |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  | 0 | 429 | 653 | 774 | 1,203 |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 5 years |  |  |  |  |  |
Proceeds from Notes Payable, Total |  | $ 50,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |  |  |  |
Long-Term Debt, Maturity, Year One |  |  |  |  |  |  | 12,487 |
Long-Term Debt, Maturity, Year Two |  |  |  |  |  |  | 13,126 |
Long-Term Debt, Maturity, Year Three |  |  |  |  |  |  | 2,252 |
Interest Expense, Total |  |  |  |  |  |  | $ 1,727 | $ 2,097
Interest Expense, Debt, Total |  |  | $ 0 | $ 411 | $ 633 | $ 1,344 |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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