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Note 3 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues $ 58,749 $ 35,840 $ 109,202 $ 70,760
UNITED STATES        
Revenues 30,989 19,384 60,111 37,839
CHINA        
Revenues 7,480 1,552 11,177 3,717
Other [Member]        
Revenues $ 20,280 $ 14,904 $ 37,914 $ 29,204