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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income (loss) attributable to Sterling common stockholders $ (17,025) $ 3,287 $ (21,602) $ (4,215)
Revaluation of the of noncontrolling interest obligations reflected in retained earnings, net of tax 1,501 (777) (353) (476)
$ (15,524) $ 2,510 $ (21,955) $ (4,691)
Denominator:        
Weighted average common shares outstanding — basic (in Shares) 16,629,630 16,359,597 16,612,924 16,341,037
Shares for dilutive stock options and warrants (in Shares)   84,000    
Weighted average common shares outstanding and assumed conversions— diluted (in Shares) 16,629,630 16,444,324 16,612,924 16,341,037
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ (0.93) $ 0.15 $ (1.32) $ (0.29)
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ (0.93) $ 0.15 $ (1.32) $ (0.29)