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Note 13 - Net Loss Per Share Attributable to Sterling Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Numerator:            
Net loss attributable to Sterling common stockholders before noncontrolling interest revaluation   $
(9,238
 )   $
(20,402
 )   $
(9,781
 )
Revaluation of a noncontrolling interest due to a new agreement    
--
      
(18,774
 )    
--
  
    $
(9,238
 )   $
(39,176
 )   $
(9,781
 )
Denominator:                        
Weighted average common shares outstanding — basic    
23,140
      
19,375
      
18,063
  
Shares for dilutive unvested stock    
--
      
--
      
--
  
Weighted average common shares outstanding and assumed conversions— diluted    
23,140
      
19,375
      
18,063
  
Basic and diluted net loss per share attributable to Sterling common stockholders   $
(0.40
 )   $
(2.02
 )   $
(0.54
 )