Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 6,945		$ 14,551		$ 14,597	$ 22,947
Cost of revenues	(7,026)		(14,769)		(14,544)	(23,882)
Total operating expenses	2,632		8,061		4,317	9,159
Net loss before allocation to noncontrolling interests	(1,714)	$ (717)	(3,646)	$ 687	(2,431)	(2,959)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	6,664		12,671		13,862	20,618
Cost of revenues	(7,026)		(14,394)		(14,544)	(23,132)
Total operating expenses	(589)		(322)		(848)	(712)
Net loss before allocation to noncontrolling interests	$ (968)		$ (2,126)		$ (1,553)	$ (3,407)