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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Computation for earnings per share
                                 
    Three Months Ended June 30,     Six Months Ended June 30,  
    2012     2011     2012     2011  

Net income

  $ 3,328,097     $ 3,728,889     $ 7,939,450     $ 7,360,624  

Weighted average number of outstanding shares

    3,101,170       2,967,002       3,066,002       2,902,788  

Earnings per share

  $ 1.07     $ 1.26     $ 2.59     $ 2.54