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Note 11 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months
Ended
September 30,
  Nine Months
Ended
September 30,
    2015   2014   2015   2014
Numerator:                                
Net income (loss) attributable to Sterling common stockholders   $ 256     $ (3,935 )   $ (19,278 )   $ (2,529 )
                                 
Denominator:                                
Weighted average common shares outstanding — basic     19,628       18,809       19,269       17,814  
Shares for dilutive unvested stock and stock options                        
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted     19,628       18,809       19,269       17,814  
Basic and diluted income (loss) per share attributable to Sterling common stockholders   $ 0.01     $ (0.21 )   $ (1.00 )   $ (0.14 )