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Note 11 - Revenues - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 29,197 $ 23,308 $ 56,186 $ 47,079
UNITED STATES        
Revenues 13,151 9,341 24,328 19,271
Europe [Member]        
Revenues 8,026 6,340 16,615 13,983
Asia [Member]        
Revenues 5,695 5,554 11,233 9,976
Rest of the World [Member]        
Revenues $ 2,325 $ 2,073 $ 4,010 $ 3,849