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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Weighted Average Shares Used in Calculation of Basic and Diluted Earnings Per Share | The following is a reconciliation of the weighted average shares used in the basic and diluted net income per common share computations.
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Weighted average common shares-basic |  |  | 19,431,093 |  |  |  | 18,675,694 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Unexercised stock options net of treasury share repurchase |  |  | 260,048 |  |  |  | 440,501 |
Weighted average common shares-diluted |  |  | 19,691,141 |  |  |  | 19,116,195 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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