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Earnings per Share (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic income per share                      
Net income $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 5,503,030 $ 5,431,760 $ 5,860,950 $ 4,852,924 $ 14,672,663 $ 21,648,664 $ 15,551,536
Weighted average common stock outstanding - denominator                 18,456,781 18,349,332 17,435,218
Net income per share $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.30 $ 0.30 $ 0.32 $ 0.26 $ 0.79 $ 1.18 $ 0.89
Diluted income per share                      
Net income $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 5,503,030 $ 5,431,760 $ 5,860,950 $ 4,852,924 $ 14,672,663 $ 21,648,664 $ 15,551,536
Weighted average common stock outstanding - denominator                 18,456,781 18,349,332 17,435,218
Effect of dilution Warrant                       1,028
Weighted average common stock outstanding - denominator                 18,456,781 18,349,332 17,436,246
Diluted income per share $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.30 $ 0.30 $ 0.32 $ 0.26 $ 0.79 $ 1.18 $ 0.89