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Note 10 - Segment Data - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenues [1] $ 26,288 $ 25,142
UNITED STATES    
Revenues 15,191 15,548
Non-US [Member]    
Revenues $ 11,097 $ 9,594
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.