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Note 12 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Details) - Basic Net Income (Loss) per Share Attributable to Sterling Common Stockholders (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income (loss) attributable to Sterling common stockholders $ 1,200 $ (17,025) $ 1,406 $ (21,602)
Revaluation of the noncontrolling interest obligations reflected in retained earnings, net of tax   1,501   (353)
$ 1,200 $ (15,524) $ 1,406 $ (21,955)
Denominator:        
Weighted average common shares outstanding — basic 17,942,124 16,629,630 17,308,551 16,612,924
Shares for dilutive unvested common stock and stock options 168,000   155,000  
Weighted average common shares outstanding and assumed conversions — diluted 18,110,025 16,629,630 17,464,229 16,612,924
Basic earnings (loss) per share attributable to Sterling common stockholders $ 0.07 $ (0.93) $ 0.08 $ (1.32)
Diluted earnings (loss) per share attributable to Sterling common stockholders $ 0.07 $ (0.93) $ 0.08 $ (1.32)