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DERIVATIVE INSTRUMENTS - Assets And Liabilities (Details)
9 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
bu
Oct. 31, 2019
USD ($)
bu
Jul. 31, 2019
USD ($)
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 273,892 $ 52,516 $ 113,807
Financial Assets 423,773 $ 823,098  
Derivative liabilities 64,326    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Accounts Payable      
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 46,000    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 5,995,000 7,495,000  
Additional nonmonetary notional amount | bu 1,765,000 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  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 2,215,000 3,345,000  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 2,015,000 4,150,000  
Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 3,355,000 5,398,000  
Additional nonmonetary notional amount | bu 215,000 4,000,000  
Heron Lake BioEnergy, LLC | Derivatives held by a broker      
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 228,000 $ 52,000  
Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 2,055,000 2,131,000  
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 1,085,000 3,267,000  
Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Financial Assets $ 423,773 $ 823,098  
Derivative liabilities 64,326    
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets 395,281 612,713  
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets   114,562  
Derivative liabilities 32,500    
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets 28,492 20,060  
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets   $ 75,763  
Derivative liabilities $ 31,826