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Note 11 - Revenues - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 26,989 $ 23,771
UNITED STATES    
Revenues 11,177 9,930
Europe [Member]    
Revenues 8,589 7,643
Asia [Member]    
Revenues 5,538 4,422
Rest of the World [Member]    
Revenues $ 1,685 $ 1,776