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Note 6 - Long-term Debt - Notes Payable (Details) - Senior Promissory Notes [Member] - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 22, 2022
Senior Promissory Notes $ 6,000,000 $ 6,000,000   $ 6,000,000
Less: unamortized debt discount (1,165,949) (1,311,989) $ (1,193,206) $ (695,749)
Senior Promissory Notes payable 4,834,051 4,688,011    
Current portion of Senior Promissory Notes payable 0 0    
Senior Promissory Notes payable, less current portion $ 4,834,051 $ 4,688,011