Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 8,567	$ 8,260
Cost of revenues	(8,125)	(7,659)
Total operating expenses	1,180	2,146
Net loss before allocation to noncontrolling interests	(1,140)	(570)
VIEs [Member]
Revenues	8,567	8,253
Cost of revenues	(8,125)	(7,659)
Total operating expenses	(711)	(1,262)
Net loss before allocation to noncontrolling interests	$ (322)	$ (678)