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	3,376,730		3,376,730
Dividends	(163,677)		(163,677)
Shares of common stock repurchased and retired (in shares)		(1,791)
Shares of common stock repurchased and retired	(114,958)		(114,958)
Stock options and stock appreciation rights exercised (in shares)		4,400
Stock options and stock appreciation rights exercised	166,585		166,585
Share-based compensation expense	17,737		17,737
Amortization related to postretirement health benefits	788			788
Net unrealized gain on investments	1,558,762			1,558,762
Stockholders' Equity, Other	22,438		22,438
Balance, end of year at Mar. 31, 2013	119,503,295	1	109,125,314	10,377,980
Balance, end of year, shares at Mar. 31, 2013		2,045,968
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	986,438		986,438
Dividends	(162,946)		(162,946)
Shares of common stock repurchased and retired (in shares)		(500)
Shares of common stock repurchased and retired	(39,825)		(39,825)
Stock options and stock appreciation rights exercised (in shares)		196
Stock options and stock appreciation rights exercised	(19)		(19)
Share-based compensation expense	21,572		21,572
Amortization related to postretirement health benefits	366			366
Net unrealized gain on investments	3,101			3,101
Income tax benefit from share-based compensation	2,889		2,889
Balance, end of year at Mar. 31, 2014	$ 128,873,730	$ 1	$ 117,522,858	$ 11,350,871
Balance, end of year, shares at Mar. 31, 2014		2,036,831