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Note 10 - Segment and Related Information - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Total revenues $ 28,778 $ 26,989
UNITED STATES    
Total revenues 12,239 11,177
Europe [Member]    
Total revenues 7,823 8,589
CHINA    
Total revenues 6,733 5,538
Rest of the World [Member]    
Total revenues $ 1,983 $ 1,685