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Note 3 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Revenues $ 50,645 $ 50,453
UNITED STATES    
Revenues 26,537 29,122
CHINA    
Revenues 6,113 3,697
Other [Member]    
Revenues $ 17,995 $ 17,634