LEASES (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jul. 31, 2020	Jul. 31, 2020	Nov. 01, 2019
Leases
Right of use assets	$ 20,290,101	$ 20,290,101
Lease liabilities	$ 20,290,101	$ 20,290,101
Lease, Practical Expedients, Package [true false]		true
Weighted average discount rate	4.87%	4.87%
Weighted average remaining lease term	4 years	4 years
Minimum
Leases
Remaining term		1 year
Maximum
Leases
Remaining term		7 years
ASU 2016-02 | Restatement
Leases
Right of use assets			$ 23,600,000
Lease liabilities			$ 23,600,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Cost of Goods Sold
Leases
Operating lease costs	$ 803,000	$ 2,375,000
Heron Lake BioEnergy, LLC | Cost of Goods Sold
Leases
Operating lease costs	$ 591,000	$ 1,731,000