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Note 12 - Net (Loss) Income per Share Attributable to Sterling Common Stockholders (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
March 31,
 
   
2015
   
2014
 
Numerator:
           
Net (loss) income attributable to Sterling common stockholders
  $ (16,992 )   $ 205  
                 
Denominator:
               
Weighted average common shares outstanding – basic
    18,902       16,668  
Shares for dilutive unvested stock and stock options 
    -       187  
Weighted average common shares outstanding and incremental shares assumed repurchased – diluted 
    18,902       16,855  
Basic and diluted (loss) earnings per share attributable to Sterling common stockholders
  $ (0.90 )   $ 0.01