Document and Entity Information Document - USD ($)	12 Months Ended
	Oct. 31, 2017	Jan. 29, 2018	Apr. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Granite Falls Energy, LLC
Entity Central Index Key	0001181749
Current Fiscal Year End Date	--10-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Oct. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,606
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 20,094,000