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Note 9 - Segment Information - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 23,843 $ 19,913 $ 69,366 $ 59,847
UNITED STATES        
Revenues 13,844 12,787 44,758 37,510
Foreign [Member]        
Revenues $ 9,999 $ 7,126 $ 24,608 $ 22,337