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Note 13 - Net Loss Per Share Attributable to Sterling Common Stockholders - Basic Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net loss attributable to Sterling common stockholders before noncontrolling interest revaluation                 $ (9,238) $ (20,402) $ (9,781)
Revaluation of a noncontrolling interest due to a new agreement                 (18,774)
Net income (loss) attributable to Sterling common stockholders $ (6,348) $ 2,415 $ 2,023 $ (7,328) $ (19,898) $ 256 $ (2,542) $ (16,992) $ (9,238) $ (39,176) $ (9,781)
Weighted average common shares outstanding — basic (in shares)                 23,140 19,375 18,063
Shares for dilutive unvested stock (in shares)                
Weighted average common shares outstanding and assumed conversions— diluted (in shares)                 23,140 19,375 18,064
Basic and diluted net loss per share attributable to Sterling common stockholders (in dollars per share) $ (0.25) $ 0.10 $ 0.09 $ (0.37) $ (1.01) $ 0.01 $ (0.13) $ (0.90) $ (0.40) $ (2.02) $ (0.54)