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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 ($) | Sep. 30, 2023 | Dec. 31, 2022
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U.S. Treasury notes, Cost | $ 53,685,255 | $ 33,888,165
U.S. Treasury notes, Gross Unrealized Gain (Loss) | (136,239) | (367,764)
U.S. Treasury notes, Fair Value | $ 53,549,016 | $ 33,520,401

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