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Note 5 - Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

Estimated

         
  

Useful Lives

  

September 30,

  

December 31,

 
  

in Years

  

2021

  

2020

 

Land

   $30,892  $30,869 

Land improvements

 8 - 15   7,621   7,620 

Buildings and improvements

 13 - 39   113,196   121,105 

Rental machinery and equipment

 2 - 7   906,859   897,398 

Machinery and equipment - other

 7   51,961   54,842 

Furniture, fixtures and computers

 3 - 5   20,040   16,928 

Automobiles and other vehicles

 5   25,704   25,948 

Leasehold improvements

 

7 - 15, or lease term if shorter

   12,536   12,773 

Construction in progress - machinery and equipment

    10,755   24,381 
      1,179,564   1,191,864 

Less: Accumulated depreciation

     (950,570)  (919,157)

Total property, plant and equipment, net

    $228,994  $272,707 
Depreciation and Amortization Expense [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Services

 $12,471  $14,582  $40,626  $47,616 

Products

  114   144   378   567 

General and administrative expenses

  1,507   1,224   4,527   4,737 

Total

 $14,092  $15,950  $45,531  $52,920