Note 14 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue from contract with Customer		$ 988	$ 5,058	$ 4,813	$ 11,461
Loss from operations		(5,257)	(6,493)	(13,233)	(12,121)
Interest expense		541	767	1,086	1,522
Depreciation and amortization		1,629	1,609	3,278	3,221
Acquisitions of plant, property and equipment		497	1,939	1,298	4,143
Total revenues		988	5,086	4,813	11,489
Assets	[1]	80,101		80,101		$ 93,359
UNITED STATES
Total revenues		91	4,994	3,841	10,658
Non-US [Member]
Total revenues		897	92	972	831
Intersegment Eliminations [Member]
Assets	[2]	(135,571)		(135,571)		(141,851)
Gevo [Member]
Revenue from contract with Customer		897	92	1,022	831
Loss from operations		(2,808)	(2,960)	(5,689)	(5,633)
Interest expense		538	767	1,081	1,522
Depreciation and amortization		50	50	106	102
Acquisitions of plant, property and equipment		69	62	79	62
Gevo [Member] | Operating Segments [Member]
Assets		76,800		76,800		91,861
Gevo Development / Agri-Energy [Member]
Revenue from contract with Customer		91	4,994	3,791	10,658
Loss from operations		(2,449)	(3,533)	(7,544)	(6,488)
Interest expense		3		5
Depreciation and amortization		1,579	1,559	3,172	3,119
Acquisitions of plant, property and equipment		428	$ 1,877	1,219	$ 4,081
Gevo Development / Agri-Energy [Member] | Operating Segments [Member]
Assets		$ 138,872		$ 138,872		$ 143,349

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

[2] Includes intercompany sales of $0.1 million during the six months ended June 30, 2020 and $0.4 million for the year ended December 31, 2019 for hydrocarbon sales.