Note 4 - Leases, Right-to-use Assets and Related Liabilities - Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Amortization of right-of-use assets	[1]	$ 464	$ 0
Interest on lease liabilities	[2]	297	1	$ 627		$ 2
Operating lease cost		64	11	192		545
Short-Term lease cost		377	376	1,003		556
Variable lease cost	[3]	94	36	164		108
Total lease cost		1,296	$ 424	2,916		1,212
Amortization of right-of-use assets		$ 400		930	[1]	1	[1]
Operating cash flows from finance leases				627		2
Operating cash flows from operating leases				192		545
Finance cash flows from finance leases				5,975		1
Right-of-use asset purchased with financing leases				28,416		13
Right-of-use asset purchased with operating lease				$ 1,611		$ 0
Weighted-average remaining lease term, finance lease (months) (Month)		225 months	53 months	225 months		53 months
Weighted-average remaining lease term, operating leases (months) (Month)		88 months	10 months	88 months		10 months
Weighted-average discount rate - finance leases	[4]	5.00%	21.00%	5.00%		21.00%
Weighted-average discount rate - operating leases	[4]	5.00%	12.00%	5.00%		12.00%

[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.

[3] Represents amounts incurred in excess of minimum payments, including payments for common area expenses under our office and research facility lease, and additional amounts due under our Gevo RNG leases based on the number of cows maintained by the owners of the respective facilities.

[4] The discount rate used for operating leases is based on our implicit borrowing rate ("IBR") at the date the Company entered into the lease. The Company estimated the IBR based collateralized borrowings for similar terms and payments.