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Note 7 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details) - Derivative Financial Instruments, Liabilities [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Balance $ 1,200 $ 7,050
Change in fair value (120) (5,850)
Balance $ 1,080 $ 1,200