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Note 2 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenues [1] $ 29,941 $ 26,288
UNITED STATES    
Revenues 16,372 15,191
Non-US [Member]    
Revenues $ 13,569 $ 11,097
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.