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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment, Gross | $ 116,137 | $ 110,646
Less: accumulated depreciation | (63,727) | (61,167)
Property, Plant and Equipment, Net | 52,410 | 49,479
Liquefaction Plants and Systems [Member] |  |
Property, Plant and Equipment, Gross | 55,932 | 48,523
Building [Member] |  |
Property, Plant and Equipment, Gross | 2,066 | 2,066
Vehicles [Member] |  |
Property, Plant and Equipment, Gross | 49,504 | 49,689
Office Equipment [Member] |  |
Property, Plant and Equipment, Gross | 545 | 458
Construction in Progress [Member] |  |
Property, Plant and Equipment, Gross | 8,058 | 9,879
Leasehold Improvements [Member] |  |
Property, Plant and Equipment, Gross | $ 32 | $ 31

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