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Note 11 - Net (Loss) Income per Share Attributable to Sterling Common Stockholders (Tables)
6 Months Ended
Jun. 30, 2015
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,
    2015   2014   2015   2014
Numerator:                                
Net (loss) income attributable to Sterling common stockholders   $

(2,542

)   $ 1,200     $

(19,534

)   $ 1,406  
                                 
Denominator:                                
Weighted average common shares outstanding — basic     19,270       17,942       19,041       17,309  
Shares for dilutive unvested stock and stock options     -       168       -       155  
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted     19,270       18,110       19,041       17,464  
Basic and diluted (loss) earnings per share attributable to Sterling common stockholders   $

 (0.13

)   $ 0.07     $

(1.03

)   $ 0.08