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Note 10 - Segment Information (Details Textual) gal in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022 gal	Sep. 30, 2021
Number of Reportable Segments			3
GallonPerYear (Gallon)			65
California Ethanol [Member]
GallonPerYear (Gallon)			65
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member]
Number of Major Customers	2	2	2	2
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	73.00%	77.00%	73.00%	75.00%
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage	26.00%	21.00%	27.00%	24.00%
India Biodiesel [Member]
GallonPerYear (Gallon)			50
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage		71.00%	52.00%	66.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage		23.00%	23.00%	16.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Three [Member]
Concentration Risk, Percentage			22.00%

X

- Definition

Represents amount of gallon per year.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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