The amount of increase (decrease) in the at-the-market offering of stock during the period.

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Amount of borrowings-related interest capitalized during the period.

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Amount of finance-lease-related interest capitalized to property, plant and equipment during the period.

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Represents the number of customers.

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The value of the remaining number of shares authorized to be issuable under a stock offering program.

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The percentage of revenue reduction.

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The interest rate on restricted cash.

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Represents the number of patents licensed, as of the specified date, that are associated with the technology to convert ethanol to hydrocarbons.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of investment in marketable security.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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Note 1 - Nature of Business, Financial Condition and Basis of Presentation (Details Textual)			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 21, 2021 USD ($)	Jan. 19, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Apr. 15, 2021 USD ($)
Proceeds from Issuance or Sale of Equity, Total		$ 321,900,000
Proceeds from Issuance of Common Stock						$ 487,549,000	$ 69,985,000
Restricted Cash, Total			$ 120,000,000.0	$ 120,000,000.0		120,000,000.0
Payments to Acquire Intangible Assets						9,000,000	(0)
Amortization of Intangible Assets, Total				100,000	$ 100,000	100,000	100,000
Interest Expense, Total				800,000	500,000	1,500,000	1,600,000
Interest Costs Capitalized, Borrowings				400,000		800,000
Interest Costs Capitalized, Finance Leases				300,000		600,000
Income Tax Expense (Benefit), Total						0
Cash and Cash Equivalents, at Carrying Value, Ending Balance			16,201,000	16,201,000	$ 80,621,000	16,201,000	$ 80,621,000	$ 78,338,000
Marketable Securities, Total			386,200,000	$ 386,200,000		$ 386,200,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customers						2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Oil & Octane [Member]
Concentration Risk, Percentage						61.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| KLM [Member]
Concentration Risk, Percentage						38.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Oil & Octane and KLM [Member]
Concentration Risk, Percentage						98.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage								79.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| KLM [Member]
Concentration Risk, Percentage				11.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage				66.00%		57.00%	15.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| New Vision, LLC [Member]
Concentration Risk, Percentage				17.00%		26.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| HCS, New Vision, and KLM [Member]
Concentration Risk, Percentage				94.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Coryton Advanced Fuels Ltd [Member]
Concentration Risk, Percentage					52.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Total Petrochemicals & Refining USA, Inc. [Member]
Concentration Risk, Percentage					39.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Coryton Advanced Fuels and Total Petrochemicals and Refining [Member]
Concentration Risk, Percentage					91.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Titan Aviation Fuel [Member]
Concentration Risk, Percentage						10.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| HCS, New Vision and Titan [Member]
Concentration Risk, Percentage							93.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage							57.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage							17.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC, Purina Animal Nutrition, LLC, and HCS Group GmbH [Member]
Concentration Risk, Percentage							89.00%
Asset Purchase Agreement with Butamax [Member]
Payments to Acquire Intangible Assets	$ 9,000,000.0
Asset Purchase Agreement with Butamax [Member] \| Patents [Member]
Payments to Acquire Intangible Assets	4,200,000
Asset Purchase Agreement with Butamax [Member] \| Defensive Assets [Member]
Payments to Acquire Intangible Assets	$ 4,800,000
Prepaid Expenses and Other Current Assets [Member]
Interest Receivable, Current			1,500,000	$ 1,500,000		$ 1,500,000
Receivable from Bond Trustee [Member]
Restricted Cash, Total			48,784,000	48,784,000		48,784,000
Cash Pledged and Assigned to Citibank, N.A. [Member]
Restricted Cash, Total			71,200,000	71,200,000		71,200,000
Restricted Cash, Current			1,000,000.0	1,000,000.0		$ 1,000,000.0
Restricted Cash, Interest Rate						0.10%
The 2021 Bonds [Member]
Debt Instrument, Face Amount									$ 68,155,000
Debt Instrument, Unamortized Premium, Total			700,000	700,000		$ 700,000			800,000
Debt Issuance Costs, Net, Total			2,600,000	$ 2,600,000		$ 2,600,000			$ 3,000,000.0
January 2021 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares		43,750,000
Shares Issued, Price Per Share (in dollars per share) \| $ / shares		$ 8.00
At-the-market Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares				0		24,420,579
Increase (Decrease) in At-the-Market Offering of Stock			500,000,000
Proceeds from Issuance of Common Stock						$ 135,800,000
Payments of Stock Issuance Costs						3,600,000
Offering of Stock, Remaining Capacity, Value			$ 500,000,000	$ 500,000,000		$ 500,000,000
COVID-19 [Member]
Percentage of Revenue Reduction						87.00%
Minimum [Member]
Number of Patents			500	500		500
Minimum [Member] \| Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						3 years
Minimum [Member] \| Axens [Member]
Technology to Convert Ethanol to Hydrocarbons, Number of Patents Licensed			60	60		60
Maximum [Member] \| Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						5 years