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Note 6 - Property, Plant and Equipment
9 Months Ended
Sep. 30, 2023
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]

6.

Property, plant and equipment

 ​

Property, plant and equipment are summarized as follows: ​

 ​

  

September 30,

  

December 31,

 
  

2023

  

2022

 
         

Land

 $3,969  $3,969 

Land improvements

  5,431   5,431 

Leasehold improvements

  6,489   5,844 

Buildings

  36,446   35,858 

Machinery and equipment

  75,379   75,190 

Furniture and fixtures

  25,751   24,605 

Mobile equipment and other

  5,134   4,927 

Construction-in-process

  6,853   5,272 

Total property, plant and equipment

  165,452   161,096 

Less accumulated depreciation

  (98,146)  (92,436)

Net property, plant and equipment

 $67,306  $68,660