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Note 5 - Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Estimated Useful
    
December 31,
    
September 30,
  
   
Lives (Years)
    
2018
    
2019
  
         
(dollars in thousands)
  
Land
  
N/A
     $
24,705
     $
24,705
  
Land improvements
  
10-20
      
5,758
      
5,804
  
Pipelines and facilities
  
5-30
      
116,155
      
118,449
  
Storage and terminal facilities
  
10-35
      
321,096
      
326,738
  
Transportation equipment
  
3-10
      
2,798
      
3,140
  
Office property and equipment and other
  
3-20
      
26,980
      
27,415
  
Pipeline linefill and tank bottoms
  
N/A
      
10,297
      
8,258
  
Construction-in-progress
  
N/A
      
4,026
      
3,077
  
Property, plant and equipment, gross
  
 
      
511,815
      
517,586
  
Accumulated depreciation
  
 
      
(263,554
 )    
(278,768
 )
Property, plant and equipment, net
  
 
     $
248,261
     $
238,818