Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 7,216	$ 11,900			$ 21,813	$ 34,847
Cost of revenues	(7,267)	(11,857)			(21,811)	(35,739)
Total operating expenses	1,780	1,617			6,097	10,776
Net income/(loss) for the period	(2,840)	1,374	$ (2,431)	$ (2,959)	(5,271)	(1,585)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	6,967	10,314			20,829	30,932
Cost of revenues	(7,267)	(11,482)			(21,811)	(34,614)
Total operating expenses	(691)	(472)			(1,539)	(1,184)
Net income/(loss) for the period	$ (998)	$ (1,655)			$ (2,551)	$ (5,062)