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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)

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