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Note 12 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Tables)
6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2014
   
2013
   
2014
   
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       16,630       17,309       16,613  
Shares for dilutive unvested common stock and stock options 
    168       -       155       -  
Weighted average common shares outstanding and assumed conversions — diluted 
    18,110       16,630       17,464       16,613  
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 )