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Earnings Per Share (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares excluded from the diluted earnings per share calculations 37,500 107,375 37,500 75,500