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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Computation for earnings per share
                                 
    Three Months Ended September 30,     Nine Months Ended September 30,  
    2012     2011     2012     2011  

Net income

  $ 4,166,786     $ 2,539,228     $ 12,106,236     $ 9,899,851  

Weighted average number of outstanding shares

    3,153,585       3,005,504       3,095,409       2,937,403  

Earnings per share

  $ 1.32     $ 0.84     $ 3.91     $ 3.37