DEBT FACILITIES (Details) - USD ($)	24 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Line of Credit Facility
Long-term Debt	$ 8,044,894	$ 8,459,201
Less: amounts due within one year	1,405,406	659,791
Net long term debt	6,639,488	$ 7,799,410
Seasonal revolving term loan | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Interest rate (as a percent)		5.06%
Term note payable to Project Hawkeye | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	7,410,714	$ 7,500,000
Assessments payable as part of water treatment agreement, with interest at 6.55%, due in 2021 | Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	634,180	947,300
Payment	$ 189,393
Interest rate (as a percent)	6.55%
Period of worth of debt	1 year
Deposit on debt service payments	$ 364,000
Assessments payable as part of water supply agreement, with interest at 8.73%, made in February 2019 | Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt		$ 11,901
Payment	$ 3,942
Interest rate (as a percent)	8.73%