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DERIVATIVE INSTRUMENTS - Assets And Liabilities (Details)
12 Months Ended
Oct. 31, 2019
USD ($)
bu
Oct. 31, 2018
USD ($)
bu
Oct. 31, 2017
USD ($)
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 52,516   $ 75,189
Financial Assets $ 823,098 $ 957,938  
Derivative liabilities   $ 50,360  
Commodity Contract      
Derivatives, Fair Value      
Maximum term of corn, ethanol and natural gas derivatives entered to protect cash flows (in months) 24 months    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 7,495,000 3,105,000  
Additional nonmonetary notional amount | bu 4,000,000    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Derivatives held by a broker      
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 0 $ 0  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 3,345,000 575,000  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 4,150,000 2,530,000  
Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 5,398,000 2,685,000  
Additional nonmonetary notional amount | bu 4,000,000    
Heron Lake BioEnergy, LLC | Derivatives held by a broker      
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 52,000 $ 0  
Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 2,131,000 510,000  
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 3,267,000 2,175,000  
Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Financial Assets $ 823,098 $ 957,938  
Derivative liabilities   50,360  
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets 612,713 532,300  
Derivative liabilities   25,180  
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets 114,562    
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets 20,060 425,638  
Derivative liabilities   $ 25,180  
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets $ 75,763