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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Available for Sale Securities (Details) - US Treasury Notes Securities [Member] - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
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U.S. Treasury notes, Cost | $ 19,213,285 | $ 10,949,883
U.S. Treasury notes, Gross Unrealized Gain (Loss) | 41,513 | 27,086
U.S. Treasury notes, Fair Value | $ 19,254,798 | $ 10,976,969

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