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Note 11 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Tables)
6 Months Ended
Jun. 30, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Three Months
Ended June 30,
   
Six Months
Ended June 30,
 
   
2012
   
2011
   
2012
   
2011
 
Numerator:
                       
Net income (loss) attributable to Sterling common stockholders
  $ 3,287     $ 4,211     $ (4,215 )   $ 4,255  
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax
    (777 )     --       (476 )     --  
    $ 2,510     $ 4,211     $ (4,691 )   $ 4,255  
Denominator:
                               
Weighted average common shares outstanding — basic
    16,360       16,484       16,341       16,474  
Shares for dilutive stock options and warrants 
    84       111       --       130  
Weighted average common shares outstanding and assumed conversions— diluted 
    16,444       16,595       16,341       16,604  
Basic net income (loss) per share attributable to Sterling common stockholders
  $ 0.15     $ 0.26     $ (0.29 )   $ 0.26  
Diluted net income (loss) per share attributable to Sterling common stockholders
  $ 0.15     $ 0.25     $ (0.29 )   $ 0.26