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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, 2021 | Dec. 31, 2020
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U.S. Treasury notes, Cost | $ 54,494,536 | $ 37,766,133
U.S. Treasury notes, Gross Unrealized Gain (Loss) | 4,724 | 1,812
U.S. Treasury notes, Fair Value | $ 54,499,260 | $ 37,767,945

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