Note 13 - Segment Information - Net Revenue From Unaffiliated Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net revenues	$ 14,443	$ 14,632	$ 38,948	$ 47,046
UNITED STATES
Net revenues	5,562	6,226	16,235	19,319
Non-US [Member]
Net revenues	$ 8,881	$ 8,406	$ 22,713	$ 27,727