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Note 11 - Net (Loss) Income per Share Attributable to Sterling Common Stockholders (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Sterling common stockholders |  | $ | (2,542 | ) |  | $ | 1,200 |  |  | $ | (19,534 | ) |  | $ | 1,406 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 19,270 |  |  |  | 17,942 |  |  |  | 19,041 |  |  |  | 17,309 |
Shares for dilutive unvested stock and stock options |  |  | - |  |  |  | 168 |  |  |  | - |  |  |  | 155 |
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted |  |  | 19,270 |  |  |  | 18,110 |  |  |  | 19,041 |  |  |  | 17,464 |
Basic and diluted (loss) earnings per share attributable to Sterling common stockholders |  | $ | (0.13 | ) |  | $ | 0.07 |  |  | $ | (1.03 | ) |  | $ | 0.08 |

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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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