Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Spare parts	$ 1,522	$ 1,521
Total inventories	2,680	3,201
Corn [Member]
Raw materials	14	267
Enzymes and Other Inputs [Member]
Raw materials	155	184
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	795	571
Isobutanol [Member]
Finished goods	44	135
Ethanol [Member]
Finished goods		93
Distiller's Grains [Member]
Finished goods	8	54
Agri-Energy [Member]
Work in process		254
Gevo [Member]
Work in process	$ 142	$ 122

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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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a)(1))
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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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