Note 4 - Investments - Details of Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Fair value	$ 20	$ 17
Basis	34	34
Cumulative unrealized (loss) gain	(14)	(17)
Equity Securities [Member]
Fair value	20	17
Basis	34	34
Cumulative unrealized (loss) gain	$ (14)	$ (17)