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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract] |
Weighted average shares and share equivalents to calculate basic and diluted earnings per share |
|  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2009 |
Weighted average number of shares outstanding used to calculate basic EPS |  |  | 5,469,159 |  |  |  | 5,893,105 |  |  |  | 5,806,773 |
Dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted share units |  |  | 154,658 |  |  |  | 271,512 |  |  |  | 341,996 |
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS |  |  | 5,623,817 |  |  |  | 6,164,617 |  |  |  | 6,148,769 |

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