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

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Represents the number of customers.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

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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- Definition

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

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Number of new stock issued during the period.

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Note 1 - Nature of Business, Financial Condition and Basis of Presentation (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended						9 Months Ended		12 Months Ended
	Nov. 11, 2019 USD ($) shares	Sep. 30, 2019 USD ($) $ / shares	Aug. 31, 2019 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Net Income (Loss) Attributable to Parent, Total					$ (8,619)	$ (7,090)	$ (6,136)	$ (6,880)	$ (11,492)	$ (2,502)	$ (21,845)	$ (20,874)
Retained Earnings (Accumulated Deficit), Ending Balance		$ (451,171)			(451,171)						(451,171)		$ (429,326)
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 20,944			$ 20,944						20,944		$ 33,734
Proceeds from Issuance of Common Stock											9,647	36,952
Payments to Acquire Investments, Total											1,500
Income Tax Expense (Benefit), Total											$ 0
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset														$ 1,200
Operating Lease, Liability, Total														$ 1,200
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customer		2			2						2		2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Coryton Advanced Fuels Ltd [Member]
Concentration Risk, Percentage											56.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage											15.00%		66.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage													29.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage					73.00%			72.00%			72.00%	72.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage					16.00%			18.00%			17.00%	21.00%
Juhi Clean Energy [Member] \| Series A Preferred Stock [Member] \| Agri-Energy [Member]
Payments to Acquire Investments, Total		$ 1,500
Share Price \| $ / shares		$ 1			$ 1						$ 1
At-the-market Offering [Member]
Increase (Decrease) in At-the-Market Offering of Stock			$ 10,700	$ 84,900
Stock Issued During Period, Shares, New Issues \| shares					0						3,244,941
Payments of Stock Issuance Costs											$ 400
At-the-market Offering [Member] \| Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues \| shares	322,899
Proceeds from Issuance of Common Stock	$ 900
Payments of Stock Issuance Costs	$ 30
At-the-market Offering [Member] \| Sales Agent [Member]
Proceeds from Issuance of Common Stock											$ 9,900