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Debt Facilities - Estimated Annual Maturities (Details) - USD ($)
Oct. 31, 2016
Oct. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities $ 490,057  
Long-term Debt, Maturities, Repayments of Principal in Year Two 432,183  
Long-term Debt, Maturities, Repayments of Principal in Year Three 319,139  
Long-term Debt, Maturities, Repayments of Principal in Year Four 326,798  
Long-term Debt, Maturities, Repayments of Principal in Year Five 315,549  
Long-term Debt 1,883,726 $ 7,229,932
Granite Falls Energy, LLC [Member] | Revolving Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt 18,000,000  
Heron Lake BioEnergy, LLC [Member] | Revolving Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 28,000,000 $ 4,822,777