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Note 3 - Revenue - Revenues From External Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 57,833 $ 53,165 $ 116,003 $ 103,810
UNITED STATES        
Revenue from Contract with Customer, Excluding Assessed Tax 28,078 27,073 54,939 53,610
CHINA        
Revenue from Contract with Customer, Excluding Assessed Tax 7,390 7,529 13,949 13,642
Other [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 22,365 $ 18,563 $ 47,115 $ 36,558
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.