Note 21 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total revenues		$ 711	$ 5,536	$ 24,487
Loss from operations		(60,090)	(26,961)	(26,355)
Interest expense		251	2,094	2,738
Depreciation expense		5,128	5,904	6,656
Acquisitions of plant, property and equipment:		94,781	6,217	6,497
Assets	[1]	666,476	152,099
Operating Segments [Member]
Construction in process		88,989	13,132
Operating Segments [Member] | UNITED STATES
Total revenues		322	4,082	22,149
Operating Segments [Member] | Non-US [Member]
Total revenues		389	1,454	2,338
Intersegment Eliminations [Member]
Assets	[2]	(204,302)	(131,971)
Gevo [Member] | Operating Segments [Member]
Total revenues		483	1,650	2,338
Loss from operations		(33,080)	(13,215)	(12,360)
Interest expense		67	2,075	2,738
Depreciation expense		650	214	210
Acquisitions of plant, property and equipment:		10,799	4,501	130
Construction in process		442	8
Assets		555,877	152,177
Agri-Energy [Member] | Operating Segments [Member]
Total revenues		228	3,886	22,149
Loss from operations		(16,605)	(12,047)	(13,995)
Interest expense		17	19	0
Depreciation expense		4,475	5,690	6,446
Acquisitions of plant, property and equipment:		5,716	1,716	6,367
Construction in process		9,122	8,645
Assets		153,494	131,893
Renewable Natural Gas [Member] | Operating Segments [Member]
Total revenues		0	0	0
Loss from operations		(1,153)	(1,294)	0
Interest expense		167	0	0
Depreciation expense		3	0	0
Acquisitions of plant, property and equipment:		52,470	0	0
Construction in process		56,879	4,479
Assets		116,644	0
Net-Zero [Member] | Operating Segments [Member]
Total revenues		0	0	0
Loss from operations		(9,252)	(405)	0
Interest expense		0	0	0
Depreciation expense		0	0	0
Acquisitions of plant, property and equipment:		25,796	0	$ 0
Construction in process		22,546	0
Assets		$ 44,763	$ 0

[1] All other significant non-cash items relate to the activities of Gevo.

[2] Includes intercompany sales of nil and $0.1 million during the years ended December 31, 2021 and 2020, respectively, for hydrocarbon sales.