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Note 9 - Segment Information - Revenues from External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
UNITED STATES        
Revenues $ 12,787 $ 11,423 $ 37,510 $ 29,612
Foreign [Member]        
Revenues 7,126 6,407 22,337 23,158
Revenues $ 19,913 $ 17,830 $ 59,847 $ 52,770