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Note 3 - Revenue - Revenues From External Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 62,840 $ 53,473 $ 178,843 $ 157,283
UNITED STATES        
Revenue from Contract with Customer, Excluding Assessed Tax 30,476 25,595 85,415 79,205
CHINA        
Revenue from Contract with Customer, Excluding Assessed Tax 6,322 4,942 20,271 18,584
Other [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 26,042 $ 22,936 $ 73,157 $ 59,494
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.