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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] | Actual weighted average Common Shares outstanding used in calculating basic and diluted net income per share were as follows:
|  | Three months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Basic weighted average shares outstanding |  |  | 26,430,300 |  |  |  | 24,163,568 |  |  |  | 26,358,285 |  |  |  | 24,114,246 |
Effect of dilutive shares |  |  | 713,517 |  |  |  | 425,325 |  |  |  | 651,184 |  |  |  | 460,234 |
Diluted weighted average shares outstanding |  |  | 27,143,817 |  |  |  | 24,588,893 |  |  |  | 27,009,469 |  |  |  | 24,574,480 |

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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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