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Note 10 - Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended
June 30,
  Six Months
Ended
June 30,
    2016   2015   2016   2015
Numerator:                                
Net income (loss) attributable to Sterling common stockholders   $ 2,023     $ (2,542 )   $ (5,305 )   $ (19,534 )
                                 
Denominator:                                
Weighted average common shares outstanding — basic     22,762       19,270       21,261       19,041  
Shares for dilutive unvested stock     197       -       -       -  
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted     22,959       19,270       21,261       19,041  
Basic and diluted income (loss) per share attributable to Sterling common stockholders   $ 0.09     $ (0.13 )   $ (0.25 )   $ (1.03 )