Statement of Changes in Members' Equity - USD ($)	Total	Granite Falls Energy [Member]	Parent [Member]	Noncontrolling Interest [Member]
Members' Equity at Oct. 31, 2012		$ 49,855,325	$ 49,855,325	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		0	7,159,741	7,159,741
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		0	(38,336)	(38,336)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance		0	832,500	832,500
Net Income (Loss) Attributable to Noncontrolling Interest	$ 526,752	0	526,752	526,752
Cancellation of accrued distribution to noncontrolling interest	0
Net Income (Loss) Attributable to Parent	10,032,021	10,032,021	10,032,021	0
Members' Equity at Oct. 31, 2013		59,887,346	68,368,003	8,480,657
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	(5,509,080)	(5,509,080)	(5,509,080)	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance		0	3,936,000	3,936,000
Net Income (Loss) Attributable to Noncontrolling Interest	10,316,612	0	10,316,612	10,316,612
Cancellation of accrued distribution to noncontrolling interest	84,807	0	84,807	84,807
Net Income (Loss) Attributable to Parent	48,773,891	48,773,891	48,773,891	0
Members' Equity at Oct. 31, 2014		103,152,157	125,970,233	22,818,076
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	(32,136,000)	(32,136,300)	(36,757,640)	(4,621,340)
Net Income (Loss) Attributable to Noncontrolling Interest	3,360,083	0	3,360,083	3,360,083
Cancellation of accrued distribution to noncontrolling interest	0
Net Income (Loss) Attributable to Parent	$ 13,586,750	13,586,750	13,586,750	0
Members' Equity at Oct. 31, 2015		$ 84,602,607	$ 106,159,426	$ 21,556,819