MEMBERS' EQUITY (Details)		1 Months Ended	3 Months Ended
	Dec. 11, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Jan. 31, 2020 USD ($) item $ / shares shares	Jan. 31, 2019 USD ($) $ / shares	Oct. 31, 2019 USD ($) shares
Number of classes of membership units | item			1
Membership Units, Par value | $ / shares			$ 0
Common Units Authorized | shares			30,606		30,606
Common Units Issued | shares			30,606		30,606
Common Units Outstanding | shares			30,606		30,606
Distribution per unit declared (in dollars per unit) | $ / shares				$ 40.00
Amount of distribution declared				$ 1,196,000
Remaining non-controlling interest			$ 2,225,000
Non-controlling Interest
Remaining non-controlling interest			$ 2,146,183
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Distribution per unit declared (in dollars per unit) | $ / shares		$ 40
Amount of distribution declared		$ 1,224,000
Heron Lake BioEnergy, LLC
Remaining non-controlling interest	$ 2,225,000
Heron Lake BioEnergy, LLC | Other assets
Deposit Assets					$ 225,000