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Note 11 - Revenues - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 29,663 $ 24,037 $ 85,849 $ 71,116
UNITED STATES        
Revenues 12,709 11,110 37,300 30,381
Europe [Member]        
Revenues 8,366 6,777 25,569 20,617
Asia [Member]        
Revenues 7,161 4,240 18,588 14,180
Rest of the World [Member]        
Revenues $ 1,427 $ 1,910 $ 4,392 $ 5,938