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Note 12 - Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months
Ended
June 30,
  Six Months
Ended
June 30,
    2017   2016   2017   2016
Numerator:                
Net income (loss) attributable to Sterling common stockholders   $
3,662
    $
2,023
    $
1,405
    $
(5,305
)
Weighted average common shares outstanding — basic    
26,978
     
22,762
     
25,972
     
21,261
 
Shares for dilutive unvested stock and warrants    
358
     
197
     
437
     
-
 
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted    
27,336
     
22,959
     
26,409
     
21,261
 
Basic income (loss) per share attributable to Sterling common stockholders   $
0.14
    $
0.09
    $
0.05
    $
(0.25
)
Diluted income (loss) per share attributable to Sterling common stockholders   $
0.13
    $
0.09
    $
0.05
    $
(0.25
)