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Summary of Significant Accounting Policies (Narrative) (Details)
gal in Millions
12 Months Ended
Oct. 31, 2019
USD ($)
segment
gal
Oct. 31, 2018
USD ($)
Nov. 01, 2019
USD ($)
Product Information [Line Items]      
Average maximum days accounts receivable outstanding 30 days    
Impairment of long-lived assets $ 0 $ 0  
Number of reportable business segments | segment 1    
Renewable Fuels Marketing Group (RPMG)      
Product Information [Line Items]      
Equity method investment ownership percentage 5.55%    
Lawrenceville Tank, LLC      
Product Information [Line Items]      
Equity method investment ownership percentage 7.00%    
Ethanol Contracts      
Product Information [Line Items]      
Annual production capacity | gal 50    
Subsequent Event | Accounting Standards Update 2016-02 [Member]      
Product Information [Line Items]      
Operating lease, right-of-use assets     $ 2,100,000