Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Spare parts	$ 1,363	$ 1,361
Total inventories	2,341	2,491
Corn [Member]
Raw materials	237	0
Enzymes and Other Inputs [Member]
Raw materials	171	133
Nutrients [Member]
Raw materials	1	1
Palladium [Member]
Raw materials	267	235
Isobutanol [Member]
Finished goods	36	0
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	$ 211	$ 756

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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