Note 9 - Leases, Right-of-use Assets and Related Liabilities (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Lease Income, Total	$ 200		$ 100	$ 0
Finance Lease, Right-of-Use Asset, Amortization	1,400		0	0
Finance Lease, Interest Expense	$ 906	[1]	$ 0	$ 0

[1] Interest on lease liabilities of $0.9 million was capitalized as part of "Construction in progress" during the year ended December 31, 2021 (none during the years ended December 31, 2020 and 2019) and included in "Property, plant and equipment, net" in the Consolidated Balance Sheets as the related Gevo RNG facilities are still under construction.