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Note 13 - Segment Information (Details Textual) gal in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) gal	Sep. 30, 2024 USD ($)
Number of Reportable Segments			3
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Cost, Overhead | $	$ 5.0	$ 4.7	$ 15.3	$ 15.7
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
Concentration Risk, Percentage	99.50%	97.00%
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%	98.60%
India Biodiesel [Member]
GallonPerYear (Gallon)			80
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member]
Number of Major Customers		3	4	3
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	42.00%	40.00%	35.00%	41.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage	28.00%	29.00%	23.00%	33.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Three [Member]
Concentration Risk, Percentage	26.00%	28.00%	23.00%	21.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Four [Member]
Concentration Risk, Percentage			14.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member]
Number of Major Customers	3

X

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Indirect cost incurred related to good produced and service rendered.

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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.

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