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Summary of Significant Accounting Policies (Detail) - Schedule of earnings per share, basic and diluted (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Net income (in Dollars) $ 1,243,893 $ 1,681,589 $ 3,647,515 $ 3,266,657 $ 5,365,165 $ 4,203,009
Weighted average shares outstanding – basic 18,518,089 16,431,723 18,460,955 13,451,350 14,506,915 9,685,000
Effect of dilutive securities:            
Unexercised warrants 191,507 210,092 191,937 70,800 190,291 0
Weighted average shares outstanding – diluted 18,709,596 16,641,815 18,652,892 13,522,150 14,697,206 9,685,000
Earnings (loss) per share – basic (in Dollars per share) $ 0.07 $ 0.10 $ 0.20 $ 0.24 $ 0.37 $ 0.43
Earnings (loss) per share – diluted (in Dollars per share) $ 0.07 $ 0.10 $ 0.20 $ 0.24 $ 0.37 $ 0.43