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Note 10 - Revenues - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Total revenues $ 26,922 $ 29,663 $ 84,908 $ 85,849
UNITED STATES        
Total revenues 11,511 12,709 38,278 37,300
Europe [Member]        
Total revenues 7,344 8,366 22,361 25,569
CHINA        
Total revenues 6,730 7,161 19,080 18,588
Rest of the World [Member]        
Total revenues $ 1,337 $ 1,427 $ 5,189 $ 4,392