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Note 14 - Segment Data - Revenues From External Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 184,335 $ 133,937 $ 117,687
UNITED STATES      
Revenues 99,068 71,387 66,344
Non-US [Member]      
Revenues $ 85,267 $ 62,550 $ 51,343