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Note 6 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details) - Derivative Financial Instruments, Liabilities [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Balance $ 1,270 $ 1,200
Change in fair value 1,350 70
Balance $ 2,620 $ 1,270