Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 4,384	$ 8,567
Cost of revenues	(3,485)	(8,125)
Total operating expenses	(3,175)	(1,180)
Net loss before allocation to noncontrolling interests	2,310	1,140
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	2,936	8,567
Cost of revenues	(2,845)	(8,125)
Total operating expenses	(744)	(711)
Net loss before allocation to noncontrolling interests	$ (651)	$ (322)