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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, 2020
Dec. 31, 2019
U.S. Treasury notes, Cost $ 78,642,270 $ 75,488,863
U.S. Treasury notes, Gross Unrealized Gain (Loss) 9,003 (79,664)
U.S. Treasury notes, Fair Value $ 78,651,273 $ 75,409,199