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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
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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

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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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