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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, 2022 | Dec. 31, 2021
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U.S. Treasury notes, Cost | $ 33,888,165 | $ 87,541,764
U.S. Treasury notes, Gross Unrealized Gain (Loss) | (367,764) | 3,140
U.S. Treasury notes, Fair Value | $ 33,520,401 | $ 87,544,904

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