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Computation of Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted earnings per share for the year ended December 31 was as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 12,654 |  |  | $ | 15,255 |  |  | $ | 6,675 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares (in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,102 |  |  |  | 5,166 |  |  |  | 5,350 |
Dilutive effect - share-based awards |  |  | 31 |  |  |  | 12 |  |  |  | 16 |
Diluted weighted-average common shares outstanding |  |  | 5,133 |  |  |  | 5,178 |  |  |  | 5,366 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.48 |  |  | $ | 2.95 |  |  | $ | 1.25 |
Diluted |  | $ | 2.47 |  |  | $ | 2.95 |  |  | $ | 1.24 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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