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Note 2 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total revenues [1] $ 31,860 $ 25,536 $ 61,801 $ 51,824
UNITED STATES        
Total revenues 11,222 15,006 27,594 30,197
Non-US [Member]        
Total revenues $ 20,638 $ 10,530 $ 34,207 $ 21,627
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.