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

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

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

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Per share or per unit amount of equity securities issued.

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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		12 Months Ended
	Jan. 19, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 78,338	$ 525,323		$ 78,338
Proceeds from Issuance or Sale of Equity, Total	$ 321,900
Proceeds from Issuance of Common Stock			489,373	$ 958
Income Tax Expense (Benefit), Total			$ 0
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customers			4		1
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Total Petrochemicals & Refining USA, Inc. [Member]
Concentration Risk, Percentage			41.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Juhl Clean Energy [Member]
Concentration Risk, Percentage			27.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| AvFuel Corporation [Member]
Concentration Risk, Percentage			16.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Wisconsin Bioproducts [Member]
Concentration Risk, Percentage			14.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Total Petrochemicals, Juhl Clean Energy, AvFuel Corporation, and Wisconsin Bioproducts [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] \| AvFuel Corporation [Member]
Concentration Risk, Percentage			15.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| New Vision, LLC [Member]
Concentration Risk, Percentage			79.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| New Vision, LLC and AvFuel Corporation [Member]
Concentration Risk, Percentage			94.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage				73.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage				22.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC and Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage				95.00%
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
At-the-market Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares			24,420,579
Increase (Decrease) in At-the-Market Offering of Stock		$ 150,000
Proceeds from Issuance of Common Stock			$ 135,800
Offering of Stock, Remaining Capacity, Value			$ 10,600
COVID-19 [Member]
Percentage of Revenue Reduction			98.00%