Note 3 - Revenue Recognition - Revenue By Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total Revenue, net	$ 31,050	$ 27,367	$ 93,033	$ 72,472
UNITED STATES
Total Revenue, net	23,534	18,136	69,036	53,153
Europe [Member]
Total Revenue, net	1,638	1,926	4,578	4,070
Asia [Member]
Total Revenue, net	2,584	3,595	10,069	8,586
All Other Countries [Member]
Total Revenue, net	$ 3,294	$ 3,710	$ 9,350	$ 6,663