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Note D - Marketable Equity Securities - Securities Classified As Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2030
Sep. 30, 2025
Dec. 31, 2024
Fair market value   $ 46,802 $ 42,620
Cost   28,821 27,094
Unrealized gain $ 17,981 $ 17,981 $ 15,526