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Note 4 - Construction Joint Ventures (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    March 31,
2017		   December 31,
2016
Total combined:                
Current assets   $
32,782
     $
32,592
  
Less current liabilities    
(53,883
 )    
(57,598
 )
Net assets   $
(21,101
 )   $
(25,006
 )
                 
Backlog   $
92,724
     $
107,333
  
Sterling’s noncontrolling interest in backlog    
46,504
      
52,992
  
Sterling’s receivables from and equity in construction joint ventures    
7,890
      
7,130
  
Condensed Income Statement [Table Text Block]
    Three Months Ended
March 31,
    2017   2016
Total combined:                
Revenues   $
14,609
     $
8,804
  
Income before tax    
1,173
      
535
  
                 
Sterling’s noncontrolling interest:                
Revenues   $
6,488
     $
3,780
  
Income before tax    
553
      
258