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Note 13 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months
Ended
June 30,
  Six Months
Ended
June 30,
    2017   2016   2017   2016
Revenue                
Heavy Civil Construction   $
209,194
    $
189,582
    $
362,610
    $
316,149
 
Residential Construction    
37,218
     
-
     
37,218
     
-
 
Total Revenue   $
246,412
    $
189,582
    $
399,828
    $
316,149
 
                                 
Operating Income                                
Heavy Civil Construction   $
3,141
    $
3,381
    $
1,667
    $
(3,085
)
Residential Construction    
5,215
     
-
     
4,901
     
-
 
Total Operating Income   $
8,356
    $
3,381
    $
6,568
    $
(3,085
)
    June 30,
2017
 
December 31,
2016
Assets        
Heavy Civil Construction   $
356,661
    $
301,823
 
Residential Construction    
98,792
     
-
 
Total Assets   $
455,453
    $
301,823