Note 3 - Investments in Related Parties - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Total revenue	$ 3,068			$ 2,949			$ 8,891	$ 8,594
Net loss	157	$ (218)	$ (7)	222	$ 72	$ (838)	(67)	(544)
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total revenue	5,365			5,378			15,977	15,545
Total expense	10,490			8,993			28,139	25,032
Net loss	$ (5,125)			$ (3,615)			$ (12,162)	$ (9,487)