Note 16 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Total revenues		$ 24,487	$ 32,863
Loss from operations		(26,351)	(22,201)
Interest expense		2,732	3,237
Depreciation and amortization		6,656	6,520
Acquisitions of plant, property and equipment		6,497	3,123
Assets	[1]	93,359	107,035
UNITED STATES
Total revenues		22,149	31,641
Non-US [Member]
Total revenues		2,338	1,222
Intersegment Eliminations [Member]
Assets	[2]	(141,851)	(139,326)
Gevo [Member]
Total revenues		2,338	1,222
Loss from operations		(12,360)	(11,552)
Interest expense		2,732	3,237
Depreciation and amortization		210	269
Acquisitions of plant, property and equipment		130	27
Gevo [Member] | Operating Segments [Member]
Assets		91,861	105,379
Gevo Development / Agri-Energy [Member]
Total revenues		22,149	31,641
Loss from operations		(13,991)	(10,649)
Interest expense
Depreciation and amortization		6,446	6,251
Acquisitions of plant, property and equipment		6,367	3,096
Gevo Development / Agri-Energy [Member] | Operating Segments [Member]
Assets		$ 143,349	$ 140,982

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

[2] Includes intercompany sales of $0.4 million and $0.1 million during the years ended December 31, 2019 and 2018, respectively, for hydrocarbon sales.