Members' Equity (Details) - USD ($)	1 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2016	Oct. 31, 2015
Membership Units, Issued			30,606	30,606
Membership Units, Outstanding			30,606	30,606
Membership Units, Authorized			30,606
Granite Falls Energy, LLC [Member]
Distribution Made to Membership, Cash Distribution Paid per Unit	$ 315	$ 1,050
Distribution Made to Member or Limited Partner, Cash Distributions Paid	9,641,000	32,136,000
Heron Lake Bio-energy LLC [Member]
Distribution Made to Member or Limited Partner, Cash Distributions Paid	$ 3,897,000	$ 9,352,000
Distribution Made to Limited Liability Company (LLC) Member, Distributions Paid, Per Unit	$ 0.05	$ 0.12
Heron Lake Bio-energy LLC [Member] | Noncontrolling Interest [Member]
Distribution Made to Member or Limited Partner, Cash Distributions Paid		$ 4,621,000