Note 10 - Revenue - Total Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue	$ 39,536	$ 31,694	$ 111,973	$ 97,769
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Revenue	$ 30,910	$ 26,409	$ 85,984	$ 77,848
Percentage of Revenue	78.00%	84.00%	77.00%	80.00%
Europe [Member]
Revenue	$ 4,238	$ 2,954	$ 14,808	$ 11,140
Percentage of Revenue	11.00%	9.00%	13.00%	11.00%
Other Location [Member]
Revenue	$ 4,388	$ 2,331	$ 11,181	$ 8,781
Percentage of Revenue	11.00%	7.00%	10.00%	9.00%