Note 4 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finished goods:
Spare parts	$ 1,451	$ 1,405
Total inventories	3,166	4,362
Corn [Member]
Raw materials:
Raw materials	29	189
Enzymes and Other Inputs [Member]
Raw materials:
Raw materials	204	202
Nutrients [Member]
Raw materials:
Raw materials		5
Ethanol [Member]
Finished goods:
Finished goods	182	222
Isobutanol [Member]
Finished goods:
Finished goods	549	1,122
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods:
Finished goods	394	524
Distiller's Grains [Member]
Finished goods:
Finished goods	54	59
Agri-Energy [Member]
Finished goods:
Work in process	214	197
Gevo [Member]
Finished goods:
Work in process	$ 89	$ 437

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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