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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) attributable to Sterling common stockholders $ (189) $ 990 $ (21,792) $ (3,223)
Revaluation of the of noncontrolling interest obligations reflected in retained earnings or additional paid in capital, net of tax (766) (762) (1,100) (1,239)
$ (955) $ 228 $ (22,892) $ (4,462)
Denominator:        
Weighted average common shares outstanding — basic (in Shares) 16,652,074 16,404,749 16,626,118 16,362,429
Shares for dilutive stock options and warrants (in Shares)   99,000    
Weighted average common shares outstanding and assumed conversions— diluted (in Shares) 16,652,074 16,504,033 16,626,118 16,362,429
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ (0.06) $ 0.01 $ (1.38) $ (0.27)
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ (0.06) $ 0.01 $ (1.38) $ (0.27)