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COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended		12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details)	Jan. 31, 2020 USD ($) item bu	Jan. 31, 2019 USD ($)	Oct. 31, 2019 USD ($) bu
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Commitments and contingencies
Rail Car Rehabilitation Liability	$ 825,000		$ 825,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn Contracts
Commitments and contingencies
Quantity of commitment \| bu	8,120,000		7,495,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn Contracts \| Short/Sale position
Commitments and contingencies
Quantity of commitment \| bu	3,445,000		4,150,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn Contracts \| Long/Purchase position
Commitments and contingencies
Quantity of commitment \| bu	675,000		3,345,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn Contracts \| Board Members
Commitments and contingencies
Amount of corn purchased	$ 314,000	$ 1,439,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Ethanol Contracts \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 11,045,000
Anticipated sales (as a percent)	82.00%
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Ethanol Contracts \| Long/Purchase position
Commitments and contingencies
Asset impairment charges	$ 0		$ 0
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Distillers' Grains \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 877,000
Anticipated sales (as a percent)	40.00%
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn oil \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 495,000
Anticipated sales (as a percent)	100.00%
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Hopper rail cars
Commitments and contingencies
Equipment Lease, Quantity \| item	75
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC \| Corn Forward Cash and Basis Contracts Purchase Commitments
Commitments and contingencies
Quantity of commitment \| bu	4,863,000
Heron Lake BioEnergy, LLC
Commitments and contingencies
Rail Car Rehabilitation Costs	$ 562,000
Rail Car Rehabilitation Liability	562,000		$ 551,000
Heron Lake BioEnergy, LLC \| Cost of Goods Sold
Commitments and contingencies
Rehabilitation Cost	$ 11,000
Heron Lake BioEnergy, LLC \| Corn Contracts
Commitments and contingencies
Quantity of commitment \| bu	5,528,000		5,398,000
Heron Lake BioEnergy, LLC \| Corn Contracts \| Short/Sale position
Commitments and contingencies
Quantity of commitment \| bu	1,607,000		3,267,000
Heron Lake BioEnergy, LLC \| Corn Contracts \| Long/Purchase position
Commitments and contingencies
Quantity of commitment \| bu	391,000		2,131,000
Heron Lake BioEnergy, LLC \| Corn Contracts \| Board Members
Commitments and contingencies
Amount of corn purchased	$ 5,065,000	$ 1,949,000
Heron Lake BioEnergy, LLC \| Ethanol Contracts \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 11,566,000
Anticipated sales (as a percent)	85.00%
Heron Lake BioEnergy, LLC \| Ethanol Contracts \| Long/Purchase position
Commitments and contingencies
Asset impairment charges	$ 0		$ 0
Heron Lake BioEnergy, LLC \| Distillers' Grains \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 2,211,000
Anticipated sales (as a percent)	55.00%
Heron Lake BioEnergy, LLC \| Corn oil \| Short/Sale position
Commitments and contingencies
Value of commitment	$ 289,000
Anticipated sales (as a percent)	75.00%
Heron Lake BioEnergy, LLC \| Hopper rail cars
Commitments and contingencies
Equipment Lease, Quantity \| item	50
Heron Lake BioEnergy, LLC \| Corn Forward Cash and Basis Contracts Purchase Commitments
Commitments and contingencies
Quantity of commitment \| bu	7,966,000