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Note 4 - Investments - Details of Marketable Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Fair value | $ 18 | $ 22
Basis | 34 | 34
Cumulative unrealized (loss) gain | (16) | (12)
Equity Securities [Member] |  |
Fair value | 18 | 22
Basis | 34 | 34
Cumulative unrealized (loss) gain | $ (16) | $ (12)

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