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Earnings Per Share (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule of Net income per share
Net income	$ 11,031,270	$ 10,100,325
Weighted-average shares outstanding:
Basic	22,667,102	22,593,327
Effect of dilutive securities:
Stock options
Restricted stock	81,860	92,334
Diluted	22,748,962	22,685,661
Net income per basic share	$ 0.49	$ 0.45
Net income per diluted share	$ 0.48	$ 0.45

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