Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 8,396	$ 4,384
Cost of revenues	(9,113)	(3,485)
Total operating expenses	(1,098)	(3,175)
Net (loss)/income	687	(2,310)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	7,947	2,936
Cost of revenues	(8,738)	(2,845)
Total operating expenses	(390)	(744)
Net (loss)/income	$ (1,281)	$ (651)