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Note 10 - Segment Information - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues $ 24,865 $ 22,954 $ 50,007 $ 45,627
UNITED STATES        
Revenues 16,617 14,432 32,165 27,443
Non-US [Member]        
Revenues $ 8,248 $ 8,522 $ 17,842 $ 18,184