v3.26.1
Note 13 - Segment Information (Details Textual)
gal in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
gal
Jun. 30, 2025
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 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 87.40% 99.40% 89.70% 99.40%
India Biodiesel Segment [Member]        
GallonPerYear (Gallon)     80  
India Biodiesel Segment [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member]        
Number of Major Customers 3 4 3 4
India Biodiesel Segment [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer One [Member]        
Concentration Risk, Percentage 23.00% 16.00% 19.00% 19.00%
India Biodiesel Segment [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Two [Member]        
Concentration Risk, Percentage 25.00% 23.00% 23.00% 20.00%
India Biodiesel Segment [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Three [Member]        
Concentration Risk, Percentage 36.00% 25.00% 38.00% 26.00%
India Biodiesel Segment [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Customer Four [Member]        
Concentration Risk, Percentage   34.00%   28.00%