Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of Basic and diluted earnings per share
Net income	$ 2,727,211	$ 2,351,149	$ 5,814,290	$ 4,472,359
Weighted average number of common shares- Basic and diluted	14,777,610	14,765,942	14,775,869	14,763,815
Earnings per share - Basic and diluted	$ 0.18	$ 0.16	$ 0.39	$ 0.30