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Note 11 - Revenue - Total Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue $ 35,397 $ 24,723
Percentage of Revenue 100.00% 100.00%
UNITED STATES    
Revenue $ 26,306 $ 20,089
Percentage of Revenue 74.00% 81.00%
Europe [Member]    
Revenue $ 5,276 $ 2,526
Percentage of Revenue 15.00% 10.00%
Other Location [Member]    
Revenue $ 3,815 $ 2,108
Percentage of Revenue 11.00% 9.00%