Leases (Details)	12 Months Ended
	Oct. 31, 2016 USD ($) item	Oct. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 4,607,334
Operating Leases, Future Minimum Payments, Due in Two Years	3,984,816
Operating Leases, Future Minimum Payments, Due in Three Years	3,726,500
Operating Leases, Future Minimum Payments, Due in Four Years	3,589,800
Operating Leases, Future Minimum Payments, Due in Five Years	3,589,800
Operating Leases, Future Minimum Payments, Due Thereafter	13,540,650
Operating Leases, Future Minimum Payments Due	33,038,900
Granite Falls Energy, LLC [Member]
Operating Leases, Rent Expense	$ 2,985,000	$ 2,204,000	$ 2,387,000
Granite Falls Energy, LLC [Member] | Rail Cars [Member]
Equipment Lease, Quantity | item	219
Granite Falls Energy, LLC [Member] | Rail Cars [Member]
Operating Leases, Rent Expense	$ 155,000
Granite Falls Energy, LLC [Member] | Hopper Cars [Member]
Equipment Lease, Quantity | item	115
Operating Leases, Rent Expense	$ 76,000
Heron Lake BioEnergy, LLC [Member]
Operating Leases, Rent Expense	$ 2,570,000	$ 1,969,000	$ 1,829,000
Heron Lake BioEnergy, LLC [Member] | Rail Cars [Member]
Equipment Lease, Quantity | item	145
Heron Lake BioEnergy, LLC [Member] | Rail Cars [Member]
Operating Leases, Rent Expense	$ 123,000
Heron Lake BioEnergy, LLC [Member] | Hopper Cars [Member]
Equipment Lease, Quantity | item	50
Operating Leases, Rent Expense	$ 35,000