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Note 4 - Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

June 30,

  

December 31,

 
  

2025

  

2024

 

Liquefaction plants and systems

 $56,768  $56,752 

Real property and buildings

  2,082   2,082 

Vehicles and tanker trailers and equipment

  50,049   49,754 

Computer and office equipment

  688   545 

Construction in progress

  8,977   8,082 

Leasehold improvements

  32   31 
   118,596   117,246 

Less: accumulated depreciation

  (69,048)  (65,518)
  $49,548  $51,728