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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