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Note 5 - Construction Joint Ventures (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    As of December 31,
    2016   2015
Total combined:                
Current assets   $
32,592
     $
17,312
  
Less current liabilities    
(57,598
 )    
(49,371
 )
Net assets   $
(25,006
 )   $
(32,059
 )
                 
Backlog   $
107,333
     $
35,113
  
Sterling’s noncontrolling interest in backlog    
52,992
      
11,748
  
Sterling’s receivables from and equity in construction joint ventures    
7,130
      
12,930
  
Condensed Income Statement [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Total combined:                        
Revenues   $
62,440
     $
60,289
     $
51,015
  
Income before tax    
5,144
      
6,909
      
3,606
  
Sterling’s noncontrolling interest:                        
Share of revenues   $
25,537
     $
23,778
     $
20,243
  
Share of income before tax    
1,980
      
2,502
      
2,111