Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Spare parts	$ 1,365	$ 1,361
Total inventories	2,452	2,491
Enzymes and Other Inputs [Member]
Raw materials	121	133
Nutrients [Member]
Raw materials	1	1
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	725	756
Gevo [Member]
Work in process	5	5
Palladium [Member]
Other Inventory	$ 235	$ 235

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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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