Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues	$ 6,316	$ 7,652
Cost of revenues	(6,630)	(7,518)
Total operating expenses	998	1,685
Net loss before allocation to noncontrolling interests	(1,143)	(717)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	6,148	7,198
Cost of revenues	(6,327)	(7,518)
Total operating expenses	(370)	(259)
Net loss before allocation to noncontrolling interests	$ (550)	$ (585)