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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, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 100,162,357 | $ 102,015,826
Gross Unrealized Gains | 2,572,388 | 4,146,892
Gross Unrealized Losses | 800,668 | 96,334
Estimated Fair Value | 101,934,077 | 106,066,384
Amortized Cost | 24,836,032 | 23,855,873
Gross Unrealized Gains | 16,392,210 | 13,785,968
Gross Unrealized Losses | 48,983 | 128,377
Estimated Fair Value | 41,179,259 | 37,513,464
Short Term Investments Amortized Cost Basis | 6,558,840 | 6,865,406
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | 6,558,840 | 6,865,406
General obligations of U.S. states, territories and political subdivisions |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 29,374,774 | 31,883,439
Gross Unrealized Gains | 440,628 | 987,595
Gross Unrealized Losses | 298,533 | 11,734
Estimated Fair Value | $ 29,516,869 | 32,859,300
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 | $ 57,459,818 | 52,202,815
Gross Unrealized Gains | 1,619,444 | 2,604,152
Gross Unrealized Losses | 502,135 | 26,127
Estimated Fair Value | 58,577,127 | 54,780,840
Corporate debt securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 13,327,765 | 17,004,985
Gross Unrealized Gains | 512,316 | 539,832
Gross Unrealized Losses | 0 | 58,473
Estimated Fair Value | 13,840,081 | 17,486,344
Auction rate securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost |  | 924,587
Gross Unrealized Gains |  | 15,313
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 939,900
Common stocks |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 24,836,032 | 23,855,873
Gross Unrealized Gains | 16,392,210 | 13,785,968
Gross Unrealized Losses | 48,983 | 128,377
Estimated Fair Value | 41,179,259 | 37,513,464
Money market funds and certificates of deposit |  |
Available-for-sale Securities [Abstract] |  |
Short Term Investments Amortized Cost Basis | 6,558,840 | 6,865,406
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | $ 6,558,840 | $ 6,865,406

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