LEASES (Details)	12 Months Ended
	Oct. 31, 2017 USD ($) item	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
November 1, 2017 to October 31, 2018	$ 4,916,616
November 1, 2018 to October 31, 2019	4,532,800
November 1, 2019 to October 31, 2020	4,395,550
November 1, 2020 to October 31, 2021	4,393,800
November 1, 2021 to October 31, 2022	4,315,800
Thereafter	13,341,850
Total minimum lease commitments	$ 35,896,416
Minimum
Operating Leased Assets [Line Items]
Lease term	1 year
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Operating Leased Assets [Line Items]
Operating lease rent expense	$ 3,163,000	$ 2,985,000	$ 2,204,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Rail Cars
Operating Leased Assets [Line Items]
Equipment lease, quantity | item	218
Monthly lease payment	$ 181,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Hopper Cars
Operating Leased Assets [Line Items]
Equipment lease, quantity | item	115
Monthly lease payment	$ 76,000
Heron Lake BioEnergy, LLC
Operating Leased Assets [Line Items]
Operating lease rent expense	$ 2,170,000	$ 2,571,000	$ 1,969,000
Heron Lake BioEnergy, LLC | Rail Cars
Operating Leased Assets [Line Items]
Equipment lease, quantity | item	148
Monthly lease payment	$ 127,000
Heron Lake BioEnergy, LLC | Hopper Cars
Operating Leased Assets [Line Items]
Equipment lease, quantity | item	110
Monthly lease payment	$ 64,000
Heron Lake BioEnergy, LLC | Hopper Cars Renewed
Operating Leased Assets [Line Items]
Equipment lease, quantity | item	50
Lease term	10 years
Monthly lease payment	$ 25,000