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Note 4 - Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

March 31,

  

December 31,

 
  

2024

  

2023

 

Liquefaction plants and systems

 $48,642  $48,523 

Real property and buildings

  2,066   2,066 

Vehicles and tanker trailers and equipment

  51,472   49,689 

Computer and office equipment

  458   458 

Construction in progress

  8,766   9,879 

Leasehold improvements

  31   31 
   111,435   110,646 

Less: accumulated depreciation

  (62,819)  (61,167)
  $48,616  $49,479