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

September 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

  50,852   49,754 

Computer and office equipment

  705   545 

Construction in progress

  11,431   8,082 

Leasehold improvements

  31   31 
   121,869   117,246 

Less: accumulated depreciation

  (70,911)  (65,518)
  $50,958  $51,728