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Earnings per Share (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic income per share        
Net income $ 3,656,136 $ 3,610,790 $ 3,959,191 $ 8,292,481
Weighted average common stock outstanding - denominator 18,456,995 18,459,775 18,458,377 18,453,754
Net income per share $ 0.20 $ 0.20 $ 0.21 $ 0.45
Diluted income per share        
Net income $ 3,656,136 $ 3,610,790 $ 3,959,191 $ 8,292,481
Weighted average common stock outstanding - denominator 18,456,995 18,459,775 18,458,377 18,453,754
Effect of dilution            
Weighted average common stock outstanding - denominator 18,456,995 18,459,775 18,458,377 18,453,754
Diluted income per share $ 0.20 $ 0.20 $ 0.21 $ 0.45