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Earning Per Share (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Computation for earning per share        
Net Income $ 3,328,097 $ 3,728,889 $ 7,939,450 $ 7,360,624
Weighted average shares outstanding 3,101,170 2,967,002 3,066,002 2,902,788
Earnings per share $ 1.07 $ 1.26 $ 2.59 $ 2.54