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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share | The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the years ended December 31, 2012, 2011 and 2010:
|  | Year Ended December 31, 2012 |  |  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 |
Weighted average number of shares outstanding used to calculate basic EPS |  |  | 5,011,058 |  |  |  | 5,469,159 |  |  |  | 5,893,105 |
Dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted share units |  |  | 130,471 |  |  |  | 154,658 |  |  |  | 271,512 |
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS |  |  | 5,141,529 |  |  |  | 5,623,817 |  |  |  | 6,164,617 |

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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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