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Note 11 - Revenue - Total Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue $ 31,694 $ 29,697 $ 97,769 $ 84,838
Percentage of Revenue 100.00% 100.00% 100.00% 100.00%
UNITED STATES        
Revenue $ 26,409 $ 23,512 $ 77,848 $ 66,538
Percentage of Revenue 84.00% 79.00% 80.00% 78.00%
Europe [Member]        
Revenue $ 2,954 $ 3,943 $ 11,140 $ 11,396
Percentage of Revenue 9.00% 13.00% 11.00% 14.00%
Other Location [Member]        
Revenue $ 2,331 $ 2,242 $ 8,781 $ 6,904
Percentage of Revenue 7.00% 8.00% 9.00% 8.00%