CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (USD $)	Common Stock [Member]	Additional paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2010	$ 43,001	$ 22,022,122	$ 94,407,620	$ (19,166,655)	$ 102,475	$ 97,408,563
Net income	0	0	1,665,015	0	0	1,665,015
Other comprehensive income	0	0	0	0	434,516	434,516
Restricted stock awards	0	6,254	0	0	0	6,254
Restricted stock units for directors' deferred compensation plan	0	24,968	0	0	0	24,968
Cash dividends declared	0	0	(891,403)	0	0	(891,403)
Distribution of shares of treasury stock for directors' compensation	0	(33,831)	0	265,262	0	231,431
Distribution of shares of treasury stock for employee compensation	0	(6,140)	0	61,140	0	55,000
Distribution of shares of treasury stock for directors' deferred compensation	0	(7,363)	0	7,310		(53)
Distribution of shares of treasury stock granted for employee restricted stock awards	0	(7,498)	0	58,788	0	51,290
Balances at Mar. 31, 2011	43,001	21,998,512	95,181,232	(18,774,155)	536,991	98,985,581
Balances at Dec. 31, 2011	53,101	45,582,861	100,628,900	(18,894,044)	(1,441,378)	125,929,440
Net income	0	0	3,614,533	0	0	3,614,533
Other comprehensive income	0	0	0	0	295,294	295,294
Restricted stock awards	0	15,922	0	0	0	15,922
Restricted stock units for directors' deferred compensation plan	0	21,340	0	0	0	21,340
Cash dividends declared	0	0	(1,143,923)	0		(1,143,923)
Distribution of shares of treasury stock for directors' compensation	0	(28,121)	0	261,069	0	232,948
Distribution of shares of treasury stock for employee compensation	0	(8,052)	0	88,052	0	80,000
Distribution of shares of treasury stock granted for employee restricted stock awards	0	(27,514)	0	27,514	0	0
Purchase of shares of treasury stock	0	0	0	(216,808)	0	(216,808)
Balances at Mar. 31, 2012	$ 53,101	$ 45,556,436	$ 103,099,510	$ (18,734,217)	$ (1,146,084)	$ 128,828,746