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Note 5 - Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

June 30,

  

December 31,

 
  

2024

  

2023

 

Liquefaction plants and systems

 $49,195  $48,523 

Real property and buildings

  2,066   2,066 

Vehicles and tanker trailers and equipment

  49,023   49,689 

Computer and office equipment

  540   458 

Construction in progress

  9,570   9,879 

Leasehold improvements

  32   31 
   110,426   110,646 

Less: accumulated depreciation

  (62,057)  (61,167)
  $48,369  $49,479