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Note 6 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details) - Derivative Financial Instruments, Liabilities [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance $ 7,050 $ 0
Issuance of contingent consideration   3,990
Change in fair value (5,850) 3,060
Balance $ 1,200 $ 7,050