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Note 7 - Long-term Debt - Notes Payable (Details) - Senior Promissory Notes [Member] - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Oct. 13, 2023 | Jun. 22, 2022
--- | --- | --- | --- | ---
Senior promissory notes | $ 6,000,000 | $ 6,000,000 |  | $ 6,000,000
Less: unamortized debt discount | (696,437) | (1,311,989) | $ (1,193,206) | $ (695,749)
Senior Promissory Notes payable | 5,303,563 | 4,688,011 |  |
Current portion of senior promissory notes payable | 0 | 0 |  |
Senior promissory notes payable, less current portion | $ 5,303,563 | $ 4,688,011 |  |

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