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Note 10 - Segment and Related Information - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Total revenues $ 29,208 $ 29,197 $ 57,986 $ 56,186
UNITED STATES        
Total revenues 14,075 13,151 26,314 24,328
Europe [Member]        
Total revenues 7,194 8,026 15,017 16,615
CHINA        
Total revenues 5,618 5,695 12,351 11,233
Rest of the World [Member]        
Total revenues $ 2,321 $ 2,325 $ 4,304 $ 4,010