Consolidated Statements Of Stockholders' Equity (USD $)	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning balance at Dec. 31, 2009	$ 1	$ 92,528,818	$ 4,730,258	$ 97,259,077
Beginning balance (shares) at Dec. 31, 2009	2,285,289
Net income		2,554,975		2,554,975
Dividends ($.14 per share)		(319,944)		(319,944)
Stock options exercised		49,022		49,022
Stock options exercised (shares)	3,995
Share based compensation expense		110,188		110,188
Repurchase of shares		(145,622)		(145,622)
Repurchase of shares (shares)	(4,375)
Amortization related to postretirement health benefits			7,579	7,579
Net unrealized gain (loss) on investments, net of tax			(163,629)	(163,629)
Ending balance at Jun. 30, 2010	1	94,777,437	4,574,208	99,351,646
Ending balance (shares) at Jun. 30, 2010	2,284,909
Beginning balance at Dec. 31, 2010	1	98,240,109	5,688,705	103,928,815
Beginning balance (shares) at Dec. 31, 2010	2,282,596
Net income		2,614,012		2,614,012
Dividends ($.14 per share)		(302,221)		(302,221)
Stock options exercised		152,526		152,526
Stock options exercised (shares)	7,550
Share based compensation expense		106,053		106,053
Repurchase of shares		(5,210,866)		(5,210,866)
Repurchase of shares (shares)	(162,411)
Amortization related to postretirement health benefits			7,575	7,575
Net unrealized gain (loss) on investments, net of tax			1,082,268	1,082,268
Ending balance at Jun. 30, 2011	$ 1	$ 95,599,613	$ 6,778,548	$ 102,378,162
Ending balance (shares) at Jun. 30, 2011	2,127,735