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Earning Per Share (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Computation for earnings per share        
Net Income $ 4,166,786 $ 2,539,228 $ 12,106,236 $ 9,899,851
Weighted average number of oustanding shares 3,153,585 3,005,504 3,095,409 2,937,403
Earnings per share $ 1.32 $ 0.84 $ 3.91 $ 3.37