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Note 11 - Segment Information - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues [1] $ 25,536 $ 24,865 $ 51,824 $ 50,007
UNITED STATES        
Revenues 15,006 16,617 30,197 32,165
Non-US [Member]        
Revenues $ 10,530 $ 8,248 $ 21,627 $ 17,842
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.