Investments in Securities and Fair Value Schedule of Gross Realized Gains (Losses) on Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 1,487,559	$ 1,147,649	$ 1,578,053
Gross realized losses	(285,705)	(408,918)	(1,610,275)
Net realized gain (loss)	1,201,854	738,731	(32,222)
Impairments of other assets and investments	(182,667)	0	(233,069)
Net gain on other assets and investments	21,714	29,705	149,128
Realized Investment Gains (Losses)	(160,953)	29,705	(83,941)
Gain (Loss) on Investments	1,040,901	768,436	(116,163)
Special revenue issuer obligations of U S states, territories and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	139	161	0
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	0	119,001	5,417
Common stocks and nonredeemable preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	1,487,420	953,491	1,572,636
Gross realized losses	(260,194)	(173,357)	(846,500)
Auction rate securities
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	0	74,996	0
General obligations of U.S. states, territories and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross realized losses	0	(535)	(12,319)
Special revenue issuer obligations of U S states, territories and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross realized losses	(100)	(1,085)	(397)
Other than temporary impairment of securities
Schedule of Available-for-sale Securities [Line Items]
Gross realized losses	$ (25,411)	$ (233,941)	$ (751,059)