Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 548		$ 6,420		$ 2,200	$ 9,951
Cost of revenues	(501)		(6,092)		(1,993)	(9,551)
Total operating expenses	729		629		1,468	1,623
Net loss	(637)	$ (530)	(232)	$ (850)	(1,167)	(1,082)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	0		5,670		49	9,201
Cost of revenues	0		(5,672)		(39)	(9,131)
Total operating expenses	(41)		(615)		(77)	(1,112)
Net loss	$ (42)		$ (623)		$ (71)	$ (1,067)