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Earnings Per Share - Computation for Earnings Per Share (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Net Income $ 4,711,545 $ 3,328,097 $ 10,042,277 $ 7,939,450
Weighted average number of outstanding shares 3,248,197 3,101,170 3,222,977 3,066,002
Earnings per share $ 1.45 $ 1.07 $ 3.12 $ 2.59