DEBT FACILITIES - Granite Falls Energy (Details)			3 Months Ended
DEBT FACILITIES - Granite Falls Energy (Details)	Jun. 19, 2021 USD ($)	Aug. 02, 2017 USD ($) shares	Jan. 31, 2022 USD ($) installment	Oct. 31, 2021 USD ($)	Feb. 04, 2021 USD ($)	Jan. 31, 2021 USD ($)	Jun. 11, 2020 USD ($)
Line of Credit Facility
Long-term Debt			$ 32,100,000	$ 32,667,857
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Minimum maintenance of working capital			$ 20,000,000.0
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Maximum
Line of Credit Facility
Minimum Debt service coverage ratio			1.75%
$25 million Single Advance Term Promissory Note
Line of Credit Facility
Long-term Debt			$ 25,000,000	25,000,000
$25 million Single Advance Term Promissory Note \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Maximum amount			$ 25,000,000.0
Interest rate (as a percent)			3.61%
Principal installment amount			$ 1,125,000
Number of quarterly installments \| installment			18
Term of interest payment			1 year
Amount of interest payment			$ 100,000
$2.4 million Single Advance Term Promissory Note
Line of Credit Facility
Long-term Debt			2,100,000	2,400,000
$2.4 million Single Advance Term Promissory Note \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Maximum amount			2,400,000
Principal installment amount			$ 300,000
Number of quarterly installments \| installment			7
Interest rate, stated percentage			3.80%
Commitment amount	$ 3,000,000.0
Term note payable to Project Hawkeye
Line of Credit Facility
Interest rate (as a percent)			3.55%
Long-term Debt			$ 5,000,000	$ 5,267,857
Term note payable to Project Hawkeye \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Maximum amount		$ 7,500,000
Interest rate floor (as a percent)			3.55%
Maximum period of annual interest payments only		2 years
Debt instrument amortization period after first two years		7 years
Term note payable to Project Hawkeye \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Ringneck Energy and; Feed, LLC
Line of Credit Facility
Maximum amount		$ 7,500,000
One Month LIBOR \| $25 million Single Advance Term Promissory Note \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Spread above variable interest rate			3.50%
One Month LIBOR \| Term note payable to Project Hawkeye \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Spread above variable interest rate			3.05%
Ringneck Energy and; Feed, LLC \| Term note payable to Project Hawkeye \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Units purchased \| shares		1,500
Revolving Credit Promissory Note \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Maximum amount			$ 20,000,000.0
Interest rate (as a percent)			3.36%
Line of credit unused commitment fee (as a percent)			0.30%
Amounts outstanding under the credit facility					$ 5,000,000
Revolving Credit Promissory Note \| One Month LIBOR \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Spread above variable interest rate			3.25%
Letter of Credit Promissory Note
Line of Credit Facility
Maximum amount			$ 500,000
Interest rate (as a percent)			3.36%
Aggregate principal amount available for borrowing			$ 500,000			$ 500,000
Letter of Credit Promissory Note \| LIBOR
Line of Credit Facility
Spread above variable interest rate			3.25%
Amended and Restated Revolving Term Promissory Note \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Maximum amount			$ 20,000,000.0
Interest rate (as a percent)			3.61%
Line of credit unused commitment fee (as a percent)			0.50%
Amounts outstanding under the credit facility							$ 13,000,000
Amended and Restated Revolving Term Promissory Note \| LIBOR \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Spread above variable interest rate			3.50%

Granite Falls Energy, LLC 10-Q