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Earnings per Share (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic income per share        
Net income for the period - numerator $ 5,534,844 $ 4,379,071 $ 9,494,035 $ 12,671,552
Weighted average common stock outstanding - denominator 18,456,900 18,459,775 18,457,879 18,455,776
Net income per share $ 0.30 $ 0.24 $ 0.51 $ 0.69
Diluted income per share        
Net income for the period - numerator $ 5,534,844 $ 4,379,071 $ 9,494,035 $ 12,671,552
Weighted average common stock outstanding - denominator 18,456,900 18,459,775 18,457,879 18,455,776
Effect of dilution            
Weighted average common stock outstanding - denominator 18,456,900 18,459,775 18,457,879 18,455,776
Diluted income per share $ 0.30 $ 0.24 $ 0.51 $ 0.69