Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Spare parts	$ 1,521	$ 1,451
Total inventories	3,201	3,166
Corn [Member]
Raw materials	267	29
Enzymes and Other Inputs [Member]
Raw materials	184	204
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	571	394
Isobutanol [Member]
Finished goods	135	549
Ethanol [Member]
Finished goods	93	182
Distiller's Grains [Member]
Finished goods	54	54
Agri-Energy [Member]
Work in process	254	214
Gevo [Member]
Work in process	$ 122	$ 89

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products.

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