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Note 6 - Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]

6.

PROPERTY, PLANT AND EQUIPMENT

 

  

Estimated

         
  

Useful Lives

  

As of December 31,

  

(Years)

  

2020

 

2021

      

(dollars in thousands)

 

Land

  N/A  $21,826  $21,826 

Land improvements

  10-20   5,024   5,125 

Storage and terminal facilities

  10-35   249,977   257,433 

Office property and equipment and other

  3-30   23,278   21,751 

Construction-in-progress

  N/A   2,165   4,355 

Property, plant and equipment, gross

      302,270   310,490 

Accumulated depreciation

      (197,561)  (204,101)

Property, plant and equipment, net

     $104,709  $106,389 

 

Property, plant and equipment under operating leases at December 31, 2021, in which the Partnership is the lessor, had a cost basis of $305.4 million and accumulated depreciation of $199.3 million.

 

Depreciation expense for the years ended  December 31, 2020 and 2021, was $11.0 million and $9.4 million, respectively.