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Note 4 - Fair Value of Financial Instruments - Roll-forward of Convertible Notes (Details) - USD ($)
3 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Balance as of January 1, 2023 $ 11,556,000 $ 12,414,000
Fair value adjustment 212,000 (858,000)
Balance as of March 31, 2023 $ 11,768,000 $ 11,556,000