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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				6 Months Ended		12 Months Ended
	Apr. 30, 2020	Aug. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%
Restructuring Charges, Total			$ 5				$ 304
Net Income (Loss) Attributable to Parent, Total			(6,043)	$ (9,253)	$ (7,090)	$ (6,136)	(15,296)	(13,226)
Retained Earnings (Accumulated Deficit), Ending Balance			(473,282)				(473,282)		$ (457,986)
Cash and Cash Equivalents, at Carrying Value, Ending Balance			$ 6,337				6,337		$ 16,302
Proceeds from Issuance of Common Stock							2,271	$ 9,878
Income Tax Expense (Benefit), Total							0
Blocksize Capital GmbH [Member]
Payments for Software, Total							$ 100
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customer			2				2		3
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage							63.00%		15.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Coryton Advanced Fuels Ltd [Member]
Concentration Risk, Percentage							15.00%
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] \| Revenue Benchmark [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage			76.00%				16.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Coryton Advanced Fuels Ltd [Member]
Concentration Risk, Percentage			11.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage					77.00%		60.00%	72.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage					18.00%		17.00%	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							1,343,121
Proceeds from Issuance of Common Stock							$ 2,200
Offering of Stock, Remaining Capacity, Shares (in shares) \| shares			6,500,000				6,500,000
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							$ 208
Officers [Member]
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%
Certain Remaining Employees [Member]
Percentage of Salaries Reductions in Reponse to COVID-19	20.00%
COVID-19 [Member]
Percentage of Revenue Reduction							81.00%