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Note 16 - Segment Data - Revenues From External Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1] $ 117,687 $ 103,135 $ 96,179
UNITED STATES      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 66,344 64,828 56,998
Non-US [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 51,343 $ 38,307 $ 39,181
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.