CONCENTRATIONS (Details) - customer	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Concentration Risk [Line Items]
Number of Major Customers	2	2	2
Heron Lake BioEnergy, LLC
Concentration Risk [Line Items]
Number of Major Customers	3	3	3
Total revenues | Customer Concentration Risk | Eco-Energy, Inc. | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Production
Concentration Risk [Line Items]
Concentration Risk, Percentage	77.50%	77.10%	81.80%
Total revenues | Customer Concentration Risk | Eco-Energy, Inc. | Heron Lake BioEnergy, LLC | Ethanol Production
Concentration Risk [Line Items]
Concentration Risk, Percentage	77.30%	76.30%	81.30%
Total revenues | Customer Concentration Risk | Gavilon Ingredients, LLC | Heron Lake BioEnergy, LLC | Distillers' Grains
Concentration Risk [Line Items]
Concentration Risk, Percentage	16.90%	18.30%	13.70%
Total revenues | Customer Concentration Risk | RPMG, Inc. | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Distillers' Grains and Corn Oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	22.30%	23.50%	17.80%
Total revenues | Customer Concentration Risk | RPMG, Inc. | Heron Lake BioEnergy, LLC | Corn oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	3.30%	3.70%	4.50%
Accounts receivable | Credit Concentration Risk | Eco-Energy, Inc. | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Production
Concentration Risk [Line Items]
Concentration Risk, Percentage	60.70%	75.20%
Accounts receivable | Credit Concentration Risk | Eco-Energy, Inc. | Heron Lake BioEnergy, LLC | Ethanol Production
Concentration Risk [Line Items]
Concentration Risk, Percentage	80.00%	77.60%
Accounts receivable | Credit Concentration Risk | Gavilon Ingredients, LLC | Heron Lake BioEnergy, LLC | Distillers' Grains
Concentration Risk [Line Items]
Concentration Risk, Percentage	15.30%	15.40%
Accounts receivable | Credit Concentration Risk | RPMG, Inc. | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Distillers' Grains and Corn Oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	36.10%	22.80%
Accounts receivable | Credit Concentration Risk | RPMG, Inc. | Heron Lake BioEnergy, LLC | Corn oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	2.80%	2.60%