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Note 10 - Segment Information - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues $ 22,954 $ 24,409 $ 45,627 $ 45,523
UNITED STATES        
Revenues 14,432 15,403 27,443 30,914
Foreign [Member]        
Revenues $ 8,522 $ 9,006 $ 18,184 $ 14,609