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Note 11 - Revenue - Total Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue $ 30,678 $ 30,418 $ 66,075 $ 55,141
Percentage of Revenue 100.00% 100.00% 100.00% 100.00%
UNITED STATES        
Revenue $ 25,133 $ 22,937 $ 51,438 $ 43,026
Percentage of Revenue 82.00% 76.00% 78.00% 78.00%
Europe [Member]        
Revenue $ 2,910 $ 4,927 $ 8,186 $ 7,454
Percentage of Revenue 9.00% 16.00% 12.00% 14.00%
Other Location [Member]        
Revenue $ 2,635 $ 2,554 $ 6,451 $ 4,661
Percentage of Revenue 9.00% 8.00% 10.00% 8.00%