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Note 11 - Segment Information (Details Textual) gal in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 gal | Dec. 31, 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 | 1
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage |  | 100.00% |
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
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%
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%
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 |  | 47.00% | 48.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Two [Member] |  |  |
Concentration Risk, Percentage |  | 25.00% | 29.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Three [Member] |  |  |
Concentration Risk, Percentage |  | 23.00% | 12.00%
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Sales of Biogas [Member] |  |  |
Number of Major Customers |  | 1 |
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Sales of Biogas [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage |  | 100.00% |
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | D3 RIN Credits [Member] |  |  |
Number of Major Customers | 1 |  |
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | D3 RIN Credits [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage | 98.00% |  |

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