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, 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	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
Balances at Dec. 31, 2012	53,101	45,357,073	107,078,182	(18,566,490)	(2,806,929)	131,114,937
Net income	0	0	2,411,768	0	0	2,411,768
Other comprehensive income	0	0	0	0	183,731	183,731
Restricted stock awards	0	60,078	0	0	0	60,078
Restricted stock units for directors' deferred compensation plan	0	24,602	0	0	0	24,602
Cash dividends declared	0	0	(1,194,117)	0	0	(1,194,117)
Distribution of shares of treasury stock for directors' compensation	0	13,896	0	203,050	0	216,946
Distribution of shares of treasury stock for employee compensation	0	7,278	0	104,876	0	112,154
Purchase of shares of treasury stock	0	0	0	(92,630)	0	(92,630)
Sale of treasury stock	0	10,518	0	60,362	0	70,880
Balances at Mar. 31, 2013	$ 53,101	$ 45,473,445	$ 108,295,833	$ (18,290,832)	$ (2,623,198)	$ 132,908,349