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Earnings per share (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings per share      
Weighted average common share-basic 18,219,343 17,601,956 17,119,474
Effect of diluted securities:      
Unexercised stock options net of treasury share repurchase   311,589 83,469
Weighted average common share-diluted 18,219,343 17,913,545 17,202,943
Outstanding options not included in diluted earnings per share 1,487,809 1,750,213  
Number of potentially dilutive shares 344,168