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Calculation of Basic and Diluted Earnings per Share (Detail Textuals)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 42,000 21,000 42,000 21,000