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Note 2 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Total revenues $ 54,696 $ 34,172 $ 125,456 $ 95,973
UNITED STATES        
Total revenues 30,414 18,480 68,253 52,246
Non-US [Member]        
Total revenues $ 24,282 $ 15,692 $ 57,203 $ 43,727