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Note 10 - Segment Information - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Revenues $ 22,673 $ 21,114
UNITED STATES    
Revenues 13,011 15,511
Foreign [Member]    
Revenues $ 9,662 $ 5,603