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Note 5 - Construction Joint Ventures (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    June 30,
2017		   December 31,
2016
Total combined:                
Current assets   $
45,034
     $
32,592
  
Less current liabilities    
(64,672
 )    
(57,598
 )
Net assets   $
(19,638
 )   $
(25,006
 )
Backlog   $
75,670
     $
107,333
  
                 
Sterling’s noncontrolling interest in backlog   $
38,751
     $
52,992
  
Sterling’s receivables from and equity in construction joint ventures   $
7,463
     $
7,130
  
Condensed Income Statement [Table Text Block]
    Three Months Ended
June 30,		   Six Months Ended
June 30,
    2017   2016   2017   2016
Total combined:                                
Revenues   $
18,897
     $
19,750
     $
33,507
     $
28,554
  
Income before tax    
1,497
      
1,379
      
2,670
      
1,913
  
                                 
Sterling’s noncontrolling interest:                                
Revenues   $
8,674
     $
7,684
     $
15,163
     $
11,464
  
Income before tax    
718
      
593
      
1,271
      
851