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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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