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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, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 102,015,826 | $ 104,421,050
Gross Unrealized Gains | 4,146,892 | 4,773,623
Gross Unrealized Losses | 96,334 | 146,383
Estimated Fair Value | 106,066,384 | 109,048,290
Amortized Cost | 23,855,873 | 24,128,753
Gross Unrealized Gains | 13,785,968 | 15,225,459
Gross Unrealized Losses | 128,377 | 99,231
Estimated Fair Value | 37,513,464 | 39,254,981
Short Term Investments Amortized Cost Basis | 6,865,406 | 2,576,993
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | 6,865,406 | 2,576,993
General obligations of U.S. states, territories and political subdivisions |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 31,883,439 | 35,215,247
Gross Unrealized Gains | 987,595 | 1,527,794
Gross Unrealized Losses | 11,734 | 19,542
Estimated Fair Value | $ 32,859,300 | 36,723,499
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 | 50 |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 52,202,815 | 46,707,033
Gross Unrealized Gains | 2,604,152 | 2,405,725
Gross Unrealized Losses | 26,127 | 55,502
Estimated Fair Value | 54,780,840 | 49,057,256
Corporate debt securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 17,004,985 | 21,576,641
Gross Unrealized Gains | 539,832 | 823,133
Gross Unrealized Losses | 58,473 | 71,339
Estimated Fair Value | 17,486,344 | 22,328,435
Auction rate securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 924,587 | 922,129
Gross Unrealized Gains | 15,313 | 16,971
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 939,900 | 939,100
Common stocks |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 23,855,873 | 24,128,753
Gross Unrealized Gains | 13,785,968 | 15,225,459
Gross Unrealized Losses | 128,377 | 99,231
Estimated Fair Value | 37,513,464 | 39,254,981
Money market funds and certificates of deposit |  |
Available-for-sale Securities [Abstract] |  |
Short Term Investments Amortized Cost Basis | 6,865,406 | 2,576,993
Short Term Investments Gross Unrealized Gains | 0 | 0
Short Term Investments Gross Unrealized Losses | 0 | 0
Short Term Investments Estimated Fair Value | $ 6,865,406 | $ 2,576,993

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