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Net Income per Share (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Income Per Share (Textual) [Abstract]        
Options excluded from the computation of diluted net income per share 0 409,305 0 409,305