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Investments in Securities and Fair Value Schedule of Gross Unrealized Gains and Losses and Amortized Cost for Securities (Details) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 100,314,085 | $ 100,162,357
Gross Unrealized Gains | 3,251,396 | 2,572,388
Gross Unrealized Losses | 224,398 | 800,668
Estimated Fair Value | 103,341,083 | 101,934,077
Amortized Cost | 26,002,619 | 24,836,032
Available For Sale Equity Securities Gross Unrealized Gains | 21,376,110 | 16,392,210
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 11,903 | 48,983
Estimated Fair Value | 47,366,826 | 41,179,259
Short Term Investments Amortized Cost Basis | 23,779,672 | 6,558,840
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | 23,779,672 | 6,558,840
Government obligations |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 1,042,921 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 951 |
Estimated Fair Value | 1,041,970 |
General obligations of U.S. states, territories and political subdivisions |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 24,189,032 | 29,374,774
Gross Unrealized Gains | 505,513 | 440,628
Gross Unrealized Losses | 50,224 | 298,533
Estimated Fair Value | $ 24,644,321 | 29,516,869
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Number of Special Revenue Bonds | 60 |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 62,591,978 | 57,459,818
Gross Unrealized Gains | 2,217,665 | 1,619,444
Gross Unrealized Losses | 164,355 | 502,135
Estimated Fair Value | 64,645,288 | 58,577,127
Corporate debt securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 12,490,154 | 13,327,765
Gross Unrealized Gains | 528,218 | 512,316
Gross Unrealized Losses | 8,868 | 0
Estimated Fair Value | 13,009,504 | 13,840,081
Common stocks |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 26,002,619 | 24,836,032
Available For Sale Equity Securities Gross Unrealized Gains | 21,376,110 | 16,392,210
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 11,903 | 48,983
Estimated Fair Value | 47,366,826 | 41,179,259
Commercial paper, money market funds and certificates of deposit |  |
Available-for-sale Securities [Abstract] |  |
Short Term Investments Amortized Cost Basis | 23,779,672 | 6,558,840
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | $ 23,779,672 | $ 6,558,840

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