Note 6 - Property, Plant and Equipment, Net - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment	$ 117,246	$ 110,646
Less: accumulated depreciation	(65,518)	(61,167)
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization	51,728	49,479
Liquefaction Plants and Systems [Member]
Property, Plant and Equipment	$ 56,752	48,523
Liquefaction Plants and Systems [Member] \| Minimum [Member]
Property, Plant and Equipment, useful life (Year)	10 years
Liquefaction Plants and Systems [Member] \| Maximum [Member]
Property, Plant and Equipment, useful life (Year)	15 years
Real Property and Buildings [Member]
Property, Plant and Equipment	$ 2,082	2,066
Real Property and Buildings [Member] \| Minimum [Member]
Property, Plant and Equipment, useful life (Year)	3 years
Real Property and Buildings [Member] \| Maximum [Member]
Property, Plant and Equipment, useful life (Year)	25 years
Vehicles [Member]
Property, Plant and Equipment	$ 49,754	49,689
Vehicles [Member] \| Minimum [Member]
Property, Plant and Equipment, useful life (Year)	2 years
Vehicles [Member] \| Maximum [Member]
Property, Plant and Equipment, useful life (Year)	10 years
Computer Equipment [Member]
Property, Plant and Equipment	$ 545	458
Computer Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, useful life (Year)	2 years
Computer Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, useful life (Year)	7 years
Construction in Progress [Member]
Property, Plant and Equipment	$ 8,082	9,879
Leasehold Improvements [Member]
Property, Plant and Equipment	$ 31	$ 31

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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