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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 ($) | Dec. 31, 2023 | Dec. 31, 2022
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U.S. Treasury notes, Cost | $ 47,162,564 | $ 33,888,165
U.S. Treasury notes, Gross Unrealized Gain (Loss) | (49,905) | (367,764)
U.S. Treasury notes, Fair Value | $ 47,112,659 | $ 33,520,401

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