SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Investments (Details) $ / shares in Units, gal in Millions					12 Months Ended
	Jun. 10, 2019 USD ($) $ / shares shares	Jun. 29, 2018 USD ($) advisor shares	Aug. 02, 2017 USD ($)	Nov. 01, 2016 USD ($) director $ / shares shares gal	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)
Long-Lived Assets
Impairment of long-lived assets					$ 0	$ 0	$ 0
Investment
Payment for equity method investment					500,000	2,000,000	7,500,000
Proceeds from long-term debt							7,500,000
Ringneck Energy and; Feed, LLC
Investment
Expected ethanol production capacity | gal				80
Summarized Financial Information of Equity Method Investment
Current Assets					10,407,345	133,701
Total Assets					146,986,480	102,887,582
Current Liabilities					7,612,119	16,054,003
Total Liabilities					67,916,222	19,276,879
Members' Equity					79,070,259	83,610,704
Income Statement Summarized Financial Information of Equity Method Investment
Revenue					47,097,524
Gross Loss					(3,114,645)
Operating Loss					(7,300,582)	(366,913)	(472,743)
Net Loss					$ (9,892,889)	$ (272,195)	$ (297,163)
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ringneck Energy and; Feed, LLC
Investment
Units purchased | shares	100			1,500
Price per unit (in dollars per unit) | $ / shares	$ 5,000			$ 5,000
Total cost	$ 500,000			$ 7,500,000
Number of directors Company has the right to appoint | director				1
Payment for equity method investment			$ 6,750,000	$ 750,000
Note payable				$ 6,750,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Harvestone Group, LLC
Investment
Units purchased | shares		20
Payment for equity method investment		$ 2,000,000
Number of advisors GFE has the right to appoint | advisor		1
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Term note payable to Project Hawkeye | Ringneck Energy and; Feed, LLC
Investment
Proceeds from long-term debt			$ 7,500,000