Note 2 - Variable Interest Entities - Consolidated VIEs' Financial Performance (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 9,820,000	$ 6,945,000	$ 16,136,000	$ 14,597,000
Cost of revenues	(9,931,000)	(7,026,000)	(16,561,000)	(14,544,000)
Total operating expenses	1,225,000	2,632,000	2,223,000	4,317,000
Net loss	(1,403,000)	(1,714,000)	(2,546,000)	(2,431,000)
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	9,793,000	6,664,000	15,941,000	13,862,000
Cost of revenues	(9,721,000)	(7,026,000)	(16,048,000)	(14,544,000)
Total operating expenses	(373,000)	(589,000)	(743,000)	(848,000)
Net loss	$ (517)	$ (968)	$ (1,067)	$ (1,553)