Note 12 - Segment Information - Net Revenue From Unaffiliated Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net revenues	$ 13,275	$ 14,352	$ 24,505	$ 32,414
UNITED STATES
Net revenues	4,954	6,283	10,673	13,093
Non-US [Member]
Net revenues	$ 8,321	$ 8,069	$ 13,832	$ 19,321