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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% |

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