Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 38,408	$ 58,080
Cost of revenues	37,776	52,582
Total operating expenses	(6,333)	(7,186)
Net loss before allocation to noncontrolling interests	(5,221)	(1,270)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	34,418	56,172
Cost of revenues	34,637	52,582
Total operating expenses	1,635	4,652
Net loss before allocation to noncontrolling interests	$ 2,092	$ 929