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Earnings Per Share (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic income per share                      
Net income for the year - numerator $ 3,520,613 $ 5,534,844 $ 3,656,136 $ 303,055 $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 13,014,648 $ 14,672,663 $ 21,648,664
Weighted average common stock outstanding - denominator                 18,458,446 18,456,781 18,349,332
Net income per share $ 0.19 $ 0.30 $ 0.02 $ 0.02 $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.71 $ 0.79 $ 1.18
Diluted income per share                      
Net income for the year - numerator $ 3,520,613 $ 5,534,844 $ 3,656,136 $ 303,055 $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 13,014,648 $ 14,672,663 $ 21,648,664
Weighted average common stock outstanding - denominator                 18,458,446 18,456,781 18,349,332
Effect of dilution                         
Weighted average common stock outstanding - denominator                 18,458,446 18,456,781 18,349,332
Diluted income per share $ 0.19 $ 0.30 $ 0.02 $ 0.02 $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.71 $ 0.79 $ 1.18