Consolidated Statements Of Stockholders' Equity - USD ($)	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Balance, beginning of year at Dec. 31, 2013	$ 128,062,154	$ 1	$ 116,714,749	$ 11,347,404
Balance, beginning of year, shares at Dec. 31, 2013		2,037,135
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	4,360,036		4,360,036
Dividends	(325,822)		(325,822)
Shares of common stock repurchased and retired (in shares)		(8,823)
Shares of common stock repurchased and retired	(584,121)		(584,121)
Stock options and stock appreciation rights exercised (in shares)		1,507
Stock options and stock appreciation rights exercised	27,100		27,100
Share-based compensation expense	55,083		55,083
Amortization related to postretirement health benefits	732			732
Net unrealized gain on investments	1,405,194			1,405,194
Temporary equity, interest resulting from subsidiary purchase	(114,320)		(114,320)
Income tax benefit from share-based compensation	15,999		15,999
Balance, end of year at Jun. 30, 2014	132,902,035	$ 1	120,148,704	12,753,330
Balance, end of year, shares at Jun. 30, 2014		2,029,819
Balance, beginning of year at Dec. 31, 2013	128,062,154	$ 1	116,714,749	11,347,404
Balance, beginning of year, shares at Dec. 31, 2013		2,037,135
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	9,648,975
Temporary equity, interest resulting from subsidiary purchase	(114,320)
Balance, end of year at Dec. 31, 2014	137,563,706	$ 1	124,707,196	12,856,509
Balance, end of year, shares at Dec. 31, 2014		2,023,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	5,846,621		5,846,621
Dividends	(321,117)		(321,117)
Shares of common stock repurchased and retired (in shares)		(24,432)
Shares of common stock repurchased and retired	(1,747,322)		(1,747,322)
Stock options and stock appreciation rights exercised (in shares)		2,192
Stock options and stock appreciation rights exercised	54,988		54,988
Share-based compensation expense	67,654		67,654
Amortization related to postretirement health benefits	2,608			2,608
Net unrealized gain on investments	(1,835,320)			(1,835,320)
Temporary equity, interest resulting from subsidiary purchase	0
Income tax benefit from share-based compensation	26,875		26,875
Balance, end of year at Jun. 30, 2015	$ 139,658,693	$ 1	$ 128,634,895	$ 11,023,797
Balance, end of year, shares at Jun. 30, 2015		2,001,030