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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, 2019	Dec. 31, 2018
U.S. Treasury notes, Cost	$ 87,428,644	$ 86,728,590
U.S. Treasury notes, Gross Unrealized Gain	84,709	116,796
U.S. Treasury notes, Fair Value	87,513,353	86,845,386
U.S. Treasury notes, Fair Value	$ 87,513,353	$ 86,845,386

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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