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Earnings per Share (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basic income per share    
Net income $ 303,055 $ 4,681,691
Weighted average common stock outstanding - denominator 18,459,775 18,447,733
Net income per share $ 0.02 $ 0.25
Diluted income per share    
Net income $ 303,055 $ 4,681,691
Weighted average common stock outstanding - denominator 18,459,775 18,447,733
Effect of dilution      
Weighted average common stock outstanding - denominator 18,459,775 18,447,733
Diluted income per share $ 0.02 $ 0.25