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Note 13 - Segment Information (Details Textual) gal in Millions	3 Months Ended
	Mar. 31, 2024 gal	Mar. 31, 2023
Number of Reportable Segments	3
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	99.70%	77.00%
India Biodiesel [Member]
GallonPerYear (Gallon)	60
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer One [Member]
Concentration Risk, Percentage	40.00%	80.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Two [Member]
Concentration Risk, Percentage	38.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Three [Member]
Concentration Risk, Percentage	16.00%

X

- Definition

Represents amount of gallon per year.

+ References

No definition available.

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X

- Definition

Represents number of major customers.

+ References

No definition available.

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X

- 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

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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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- Details

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