Note 10 - Revenue - Total Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 38,145	$ 30,678	$ 72,437	$ 66,075
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Revenue	$ 30,069	$ 25,133	$ 55,074	$ 51,438
Percentage of Revenue	79.00%	82.00%	76.00%	78.00%
Europe [Member]
Revenue	$ 5,089	$ 2,910	$ 10,570	$ 8,186
Percentage of Revenue	13.00%	9.00%	15.00%	12.00%
Other Location [Member]
Revenue	$ 2,987	$ 2,635	$ 6,793	$ 6,451
Percentage of Revenue	8.00%	9.00%	9.00%	10.00%