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Note 2 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Total revenues [1] $ 34,920 $ 29,941
UNITED STATES    
Total revenues 18,455 16,372
Non-US [Member]    
Total revenues $ 16,465 $ 13,569
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.