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Note 10 - Basic Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net loss attributable to Sterling common stockholders $ 2,023 $ (2,542) $ (5,305) $ (19,534)
Basic (in shares) 22,761,671 19,269,977 21,260,946 19,040,870
Diluted (in shares) 22,958,551 19,269,977 21,260,946 19,040,870
Basic and diluted income (loss) per share attributable to Sterling common stockholders (in dollars per share) $ 0.09 $ (0.13) $ (0.25) $ (1.03)