Note 3 - Investments in Related Parties - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Total revenue	$ 3,124		$ 3,705		$ 5,823	$ 5,645
Net loss	(218)	$ (7)	72	$ (838)	(226)	(766)
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total revenue	5,369		5,217		10,612	10,167
Total expense	8,936		8,527		17,649	16,040
Net loss	$ (3,567)		$ (3,310)		$ (7,037)	$ (5,873)