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Earnings Per Share (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share (Textual) [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 612,300 0 459,635 176,500