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Note 10 - Segment Information (Details Textual) gal in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 gal | Sep. 30, 2022
Number of Reportable Segments |  |  | 3 |
California Ethanol [Member] |  |  |  |
GallonPerYear (Gallon) |  |  | 65 |
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales [Member] |  |  |  |
Number of Major Customers | 1 |  |  |
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage | 99.70% |  |  |
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 |  | 2 | 1 | 2
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 |  | 73.00% | 99.70% | 73.00%
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage |  | 26.00% |  | 27.00%
India Biodiesel [Member] |  |  |  |
GallonPerYear (Gallon) |  |  | 50 |
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage | 42.00% | 52.00% | 43.00% | 52.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage | 35.00% | 23.00% | 28.00% | 23.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Three [Member] |  |  |  |
Concentration Risk, Percentage | 19.00% | 22.00% | 24.00% | 22.00%
Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Sales of Biogas [Member] |  |  |  |
Number of Major Customers | 1 |  | 1 |

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