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Note 1 - Nature of Business, Financial Condition and Basis of Presentation (Details Textual) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2020	Aug. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Charges, Total			$ 299
Net Income (Loss) Attributable to Parent, Total			(9,253)	(6,136)
Retained Earnings (Accumulated Deficit), Ending Balance			(467,239)		$ (457,986)
Cash and Cash Equivalents, at Carrying Value, Ending Balance			9,289		$ 16,302
Proceeds from Issuance of Common Stock			958	$ 9,878
Income Tax Expense (Benefit), Total			$ 0
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customer			1		3
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Air Total International SA [Member]
Concentration Risk, Percentage			52.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage					57.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage					13.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage					15.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage			73.00%	68.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage			22.00%	18.00%
At-the-market Offering [Member]
Increase (Decrease) in At-the-Market Offering of Stock		$ 10,700
Stock Issued During Period, Shares, New Issues (in shares) \| shares			425,776
Proceeds from Issuance of Common Stock			$ 900
Offering of Stock, Remaining Capacity, Shares (in shares) \| shares			7,800,000
Gevo [Member]
Restructuring Charges, Total			$ 20
Gevo Development / Agri-Energy [Member]
Restructuring Charges, Total			$ 300
Workforce Reduced at Luverne Facility [Member]
Restructuring and Related Cost, Number of Positions Eliminated			26
Workforce Reduced at Corporate Headquarters [Member]
Restructuring and Related Cost, Number of Positions Eliminated			4
Employee Severance [Member]
Restructuring Charges, Total			$ 96
Lease Agreement [Member]
Restructuring Charges, Total			$ 203
Subsequent Event [Member]
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%
Officers [Member] \| Subsequent Event [Member]
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%
Certain Remaining Employees [Member] \| Subsequent Event [Member]
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%