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Note 5 - Fair Value of Financial Instruments - Roll-forward of Convertible Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Balance as of January 1, 2023 $ 11,768,000 $ 12,414,000
Fair value adjustment (4,778,251) (646,000)
Reclassification to additional paid in capital upon conversion (6,989,749)  
Balance as of March 31, 2023 $ 0 $ 11,768,000