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Note 6 - Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

September 30,

  

December 31,

 
  

2023

  

2022

 

Liquefaction plants and systems

 $48,005  $47,636 

Real property and buildings

  2,066   2,057 

Vehicles and tanker trailers and equipment

  49,489   52,647 

Computer and office equipment

  457   470 

Construction in progress

  9,620   527 

Leasehold improvements

  32   31 
   109,669   103,368 

Less: accumulated depreciation

  (59,651)  (55,699)
  $50,018  $47,669