Note 9 - Information About Geographic Areas and Operating Segments - Revenue and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Total revenue	$ 9,972	$ 16,729
Total long-lived assets	1,713		$ 1,358
North America [Member]
Total revenue	8,588	13,776
Total long-lived assets	1,542		1,179
Europe [Member]
Total revenue	222	639
Total long-lived assets	171		$ 179
Asia [Member]
Total revenue	$ 1,162	$ 2,314