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Note 13 - Segment Information (Details Textual) gal in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 gal | Jun. 30, 2024
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 | 99.40% | 95.60% | 99.40% | 92.90%
India Biodiesel [Member] |  |  |  |
GallonPerYear (Gallon) |  |  | 80 |
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] |  |  |  |
Number of Major Customers | 4 | 3 | 4 | 3
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage | 34.00% | 44.00% | 28.00% | 42.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage | 25.00% | 34.00% | 26.00% | 36.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Three [Member] |  |  |  |
Concentration Risk, Percentage | 23.00% | 17.00% | 20.00% | 17.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Four [Member] |  |  |  |
Concentration Risk, Percentage | 16.00% |  | 19.00% |

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