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Note 2 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Total revenues [1] $ 34,172 $ 31,655 $ 95,973 $ 83,479
UNITED STATES        
Total revenues 18,480 17,810 52,246 48,007
Non-US [Member]        
Total revenues $ 15,692 $ 13,845 $ 43,727 $ 35,472
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.