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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 ($) | Jun. 30, 2019 | Dec. 31, 2018
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U.S. Treasury notes, Cost | $ 85,056,102 | $ 86,728,590
U.S. Treasury notes, Gross Unrealized Gain | 36,957 | 116,796
Securities available for sale, cost | $ 85,019,145 | $ 86,845,386

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