Note 4 - Investments - Details of Marketable Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Fair value	$ 30	$ 17
Basis	34	34
Cumulative unrealized (loss) gain	(4)	(17)
Equity Securities [Member]
Fair value	30	17
Basis	34	34
Cumulative unrealized (loss) gain	$ (4)	$ (17)

Fair value of investment in security owned.

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+ Details