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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2011
Earnings per share |
Schedule of reconciliation of weighted average shares used in calculation of basic earnings per share and diluted earnings per share |
|  | Year Ended December 31, |
|  | 2011 |  | 2010 |  | 2009 |
Weighted average common shares-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 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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