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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
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net income (loss) attributable to Sterling common stockholders $ 205 $ (4,580)
Revaluation of noncontrolling interest obligations reflected in retained earnings, net of tax   (1,854)
$ 205 $ (6,434)
Denominator:    
Weighted average common shares outstanding – basic 16,667,939 16,598,255
Shares for dilutive stock options and warrants 187,000  
Weighted average common shares outstanding and assumed conversions – diluted 16,855,173 16,598,255
Basic earnings (loss) per share attributable to Sterling common stockholders $ 0.01 $ (0.39)
Diluted earnings (loss) per share attributable to Sterling common stockholders $ 0.01 $ (0.39)