DEBT FACILITIES (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018
Line of Credit Facility
Long-term Debt	$ 8,451,438	$ 8,459,201
Less: amounts due within one year	849,769	659,791
Net long term debt	7,601,669	7,799,410
Term note payable to Project Hawkeye | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	7,500,000	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	$ 947,300	$ 947,300
Frequency of payment	semi-annual	semi-annual
Payment	$ 189,393	$ 189,393
Interest rate (as a percent)	6.55%	6.55%
Period of worth of debt	1 year	1 year
Deposit on debt service payments	$ 364,000	$ 364,000
Assessments payable as part of water supply agreement, with interest at 8.73%, due in 2019 | Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	$ 4,138	$ 11,901
Frequency of payment	monthly	monthly
Payment	$ 3,942	$ 3,942
Interest rate (as a percent)	8.73%	8.73%