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Note 3 - Revenue - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Revenues $ 53,473 $ 54,287 $ 157,283 $ 163,489
UNITED STATES        
Revenues 25,595 28,645 79,205 88,756
CHINA        
Revenues 4,942 7,482 18,584 18,659
Other [Member]        
Revenues $ 22,936 $ 18,160 $ 59,494 $ 56,074