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Note 10 - Net Loss Per Share Attributable to Sterling Common Stockholders (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended
March 31,
    2017   2016
Numerator:        
Net loss attributable to Sterling common stockholders   $
(2,257
)   $
(7,328
)
                 
Denominator:                
Weighted average common shares outstanding — basic    
25,022
     
19,760
 
Shares for dilutive unvested stock    
--
     
--
 
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted    
25,022
     
19,760
 
Basic and diluted loss per share attributable to Sterling common stockholders   $
(0.09
)   $
(0.37
)