Leases Narrative (Details) (USD $)	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4,500,639
Operating Leases, Future Minimum Payments, Due in Two Years	3,802,840
Operating Leases, Future Minimum Payments, Due in Three Years	2,134,654
Operating Leases, Future Minimum Payments, Due in Four Years	626,316
Operating Leases, Future Minimum Payments, Due in Five Years	40,950
Operating Leases, Future Minimum Payments Due	11,105,399
Derivative Liabilities		75,113
Granite Falls Energy [Member] | Hopper Cars [Member]
Equipment Lease, Quantity	75
Granite Falls Energy [Member] | Rail Cars [Member]
Equipment Lease, Quantity	176
Granite Falls Energy [Member] | Rail Cars [Member]
Operating Leases, Rent Expense	139,000
Granite Falls Energy [Member] | Hopper Cars [Member]
Operating Leases, Rent Expense	47,000
Heron Lake Bioenergy [Member] | Hopper Cars [Member]
Equipment Lease, Quantity	50
Heron Lake Bioenergy [Member] | Rail Cars [Member]
Equipment Lease, Quantity	145
Heron Lake Bioenergy [Member] | Rail Cars [Member]
Operating Leases, Rent Expense	143,000
Heron Lake Bioenergy [Member] | Hopper Cars [Member]
Operating Leases, Rent Expense	35,000