CONCENTRATIONS (Details) - customer	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
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
Concentration Risk [Line Items]
Concentration Risk, Percentage	81.80%	80.30%	79.10%
Total revenues | Customer Concentration Risk | Eco-Energy, Inc. | Heron Lake BioEnergy, LLC | Ethanol
Concentration Risk [Line Items]
Concentration Risk, Percentage	81.30%	78.50%	76.90%
Total revenues | Customer Concentration Risk | Gavilon Ingredients, LLC | Heron Lake BioEnergy, LLC | Distillers' Grains
Concentration Risk [Line Items]
Concentration Risk, Percentage	13.70%	15.40%	19.20%
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	17.80%	19.70%	20.70%
Total revenues | Customer Concentration Risk | RPMG, Inc. | Heron Lake BioEnergy, LLC | Corn Oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.50%	4.40%	2.40%
Accounts receivable | Credit Concentration Risk | Eco-Energy, Inc. | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol
Concentration Risk [Line Items]
Concentration Risk, Percentage	82.00%	70.20%
Accounts receivable | Credit Concentration Risk | Eco-Energy, Inc. | Heron Lake BioEnergy, LLC | Ethanol
Concentration Risk [Line Items]
Concentration Risk, Percentage	86.80%	78.60%
Accounts receivable | Credit Concentration Risk | Gavilon Ingredients, LLC | Heron Lake BioEnergy, LLC | Distillers' Grains
Concentration Risk [Line Items]
Concentration Risk, Percentage	7.00%	11.10%
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	16.30%	26.50%
Accounts receivable | Credit Concentration Risk | RPMG, Inc. | Heron Lake BioEnergy, LLC | Corn Oil
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.30%	3.30%