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DERIVATIVE INSTRUMENTS - Assets And Liabilities (Details)
6 Months Ended 12 Months Ended
Apr. 30, 2020
USD ($)
bu
Oct. 31, 2019
USD ($)
bu
Apr. 30, 2019
USD ($)
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 351,068 $ 52,516 $ 399,875
Financial Assets 359,269 $ 823,098  
Derivative liabilities 241,650    
Accounts Payable      
Derivatives, Fair Value      
Derivative liabilities held by broker $ 40,000    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 2,640,000 7,495,000  
Additional nonmonetary notional amount | bu 1,305,000 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 $ 0  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 150,000 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 1,185,000 4,150,000  
Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 1,246,000 5,398,000  
Additional nonmonetary notional amount | bu 950,000 4,000,000  
Heron Lake BioEnergy, LLC | Derivatives held by a broker      
Derivatives, Fair Value      
Cash collateral (restricted cash) $ 351,000 $ 52,000  
Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 50,000 2,131,000  
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts      
Derivatives, Fair Value      
Total nonmonetary notional amount outstanding | bu 246,000 3,267,000  
Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Financial Assets $ 359,269 $ 823,098  
Derivative liabilities 241,650    
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets 359,269 612,713  
Not Designated as Hedging Instruments | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets   114,562  
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Corn Contracts      
Derivatives, Fair Value      
Financial Assets   20,060  
Derivative liabilities 227,550    
Not Designated as Hedging Instruments | Heron Lake BioEnergy, LLC | Ethanol Contracts      
Derivatives, Fair Value      
Financial Assets   $ 75,763  
Derivative liabilities $ 14,100