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Note 4 - Marketable Equity Securities - Securities Classified As Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair market value | $ 43,203 | $ 41,728
Cost | 30,294 | 30,350
Unrealized gain | $ 12,909 | $ 11,378

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