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Note 3 - Revenue Recognition - Revenues From External Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues $ 53,165 $ 58,749 $ 103,810 $ 109,202 $ 103,810 $ 109,202
UNITED STATES            
Revenues 27,073 30,989 53,610 60,111    
CHINA            
Revenues 7,529 7,480 13,642 11,177    
Other [Member]            
Revenues $ 18,563 $ 20,280 $ 36,558 $ 37,914