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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 ($)	Dec. 31, 2015 USD ($)
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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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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