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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 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 (loss) per common share computations.
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  |  |  |  | (Restated) |  |  |  |  |  | (Restated) |
Weighted average common shares-basic |  |  | 19,140,520 |  |  |  | 18,827,452 |  |  |  | 19,285,004 |  |  |  | 18,751,573 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unexercised stock options net of treasury share repurchase |  |  | 129,524 |  |  |  | 388,532 |  |  |  | 198,711 |  |  |  | 417,367 |
Weighted average common shares-diluted |  |  | 19,270,044 |  |  |  | 19,215,984 |  |  |  | 19,483,715 |  |  |  | 19,168,940 |

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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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