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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, 2020 | Dec. 31, 2019
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U.S. Treasury notes, Cost | $ 76,645,205 | $ 75,488,863
U.S. Treasury notes, Gross Unrealized Gain (Loss) | 22,333 | (79,664)
U.S. Treasury notes, Fair Value | $ 76,667,538 | $ 75,409,199

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