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Note 13 - Segment Information (Details Textual) gal in Millions	3 Months Ended
	Mar. 31, 2025 gal	Mar. 31, 2024
Number of Reportable Segments	3
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] | Customer One [Member] | Geographic Distribution, Domestic [Member]
Concentration Risk, Percentage	99.00%
California Ethanol [Member]
GallonPerYear (Gallon)	65
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member]
Number of Major Customers	1	1
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] | Customer One [Member]
Concentration Risk, Percentage	99.40%	99.70%
India Biodiesel [Member]
GallonPerYear (Gallon)	80
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member]
Number of Major Customers	2
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer One [Member]
Concentration Risk, Percentage	18.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Two [Member]
Concentration Risk, Percentage	73.00%

X

- Definition

Represents amount of gallon per year.

+ References

No definition available.

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- Definition

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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
-Topic 280
-SubTopic 10
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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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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