Note 3 - Investments in Related Parties - Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total revenue	$ 11,108	$ 14,482
Net loss	(953)	3,659
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total revenue	20,878	16,770
Total expense	33,858	25,626
Net loss	$ (12,980)	$ (8,856)