Consolidated Statements Of Stockholders' Equity (USD $)	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Balance, beginning of year at Dec. 31, 2012	$ 114,638,890	$ 1	$ 105,820,459	$ 8,818,430
Balance, beginning of year, shares at Dec. 31, 2012		2,043,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	7,382,405		7,382,405
Dividends	(329,569)		(329,569)
Shares of common stock repurchased and retired (in shares)		(19,460)
Shares of common stock repurchased and retired	(1,378,131)		(1,378,131)
Stock options and stock appreciation rights exercised (in shares)		49,749
Stock options and stock appreciation rights exercised	68,032		68,032
Share-based compensation expense	40,092		40,092
Amortization related to postretirement health benefits	1,575			1,575
Net unrealized gain on investments	440,996			440,996
Stockholders' Equity, Other	935,563
Income tax benefit from share-based compensation			935,563
Balance, end of year at Jun. 30, 2013	121,799,853	1	112,538,851	9,261,001
Balance, end of year, shares at Jun. 30, 2013		2,073,648
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