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Note 15 - Segment and Related Information - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Total revenues $ 118,904 $ 102,100
UNITED STATES    
Total revenues 49,831 42,054
Europe [Member]    
Total revenues 35,767 29,938
CHINA    
Total revenues 24,816 23,884
Rest of the World [Member]    
Total revenues $ 8,490 $ 6,224