Note 10 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Spare parts	$ 1,262	$ 1,361
Total inventories	2,751	2,491
Corn [Member]
Raw materials	301	0
Enzymes and Other Inputs [Member]
Raw materials	183	133
Nutrients [Member]
Raw materials	3	1
Palladium [Member]
Raw materials	265	235
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	335	756
Isobutanol [Member]
Finished goods	223	0
Ethanol [Member]
Finished goods	96	0
Agri-Energy [Member]
Work in process	83	0
Gevo [Member]
Work in process	$ 0	$ 5

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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