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Note 4 - Marketable Equity Securities - Securities Classified As Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair market value | $ 42,620 | $ 43,203
Cost | 27,094 | 30,294
Unrealized gain | $ 15,526 | $ 12,909

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