Document and Entity Information Document - shares	6 Months Ended
	Apr. 30, 2017	Jun. 14, 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-Q
Document Period End Date	Apr. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,606
Entity Current Reporting Status	Yes