Note 4 - Leases, Right-of-Use Assets and Related Liabilities (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020		Dec. 31, 2020
Operating Lease, Right-of-Use Asset		$ 1,591		$ 1,591				$ 133
Operating Lease, Liability, Noncurrent		1,732		1,732				0
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total		27,665		27,665				176
Finance Lease, Liability, Total		22,325		22,325
Finance Lease, Liability, Current		2,727		2,727				10
Finance Lease, Liability, Noncurrent		19,598		19,598				$ 162
Operating Lease, Lease Income, Total		0		200
Finance Lease, Right-of-Use Asset, Amortization		400		930	[1]	$ 1	[1]
Finance Lease, Interest Expense	[2]	$ 297	$ 1	$ 627		$ 2

[1] Amortization of right-of-use assets of $0.4 million and $0.9 million were capitalized during the three and nine months ended September 30, 2021, respectively, and included in "Property, plant and equipment, net" in the Consolidated Balance Sheets as the related Gevo RNG facilities are still under construction.

[2] Interest on lease liabilities of $0.3 million and $0.6 million were capitalized during the three and nine months ended September 30, 2021, respectively, and included in "Property, plant and equipment, net" in the Consolidated Balance Sheets as the related Gevo RNG facilities are still under construction.