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Net Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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 |  | Six months ended |
|  | June 30, |  | June 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Basic weighted-average shares outstanding |  |  | 26,691,895 |  |  | 26,424,331 |  |  | 26,649,005 |  |  | 26,322,277 |
Effect of dilutive shares |  |  | 656,444 |  |  | - |  |  | 709,435 |  |  | 676,225 |
Diluted weighted-average shares outstanding |  |  | 27,348,339 |  |  | 26,424,331 |  |  | 27,358,440 |  |  | 26,998,502 |

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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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