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Earnings per share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Weighted Average Shares Used in the Diluted EPS | The following is a reconciliation of the weighted average shares used in the diluted EPS computations.
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average common shares-basic |  |  | 18,117,405 |  |  |  | 18,144,019 |  |  |  | 18,795,194 |
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
Unexercised stock options and employee stock purchase plan |  |  | 209,691 |  |  |  | 161,092 |  |  |  | — |
Unvested time-based restricted stock awards |  |  | 123,592 |  |  |  | 138,291 |  |  |  | — |
Unvested performance-based restricted stock awards |  |  | 48,057 |  |  |  | 19,759 |  |  |  | — |
Weighted average common shares-diluted |  |  | 18,498,745 |  |  |  | 18,463,161 |  |  |  | 18,795,194 |

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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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