Derivative Instrument - Asset And Liabilities (Details)	6 Months Ended
	Apr. 30, 2016 USD ($) gal bu	Oct. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 126,874	$ 677,149
Derivative Liabilities, Current	$ 159,325	1,114
Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Total notional amount outstanding | bu	4,820,000
Ethanol Contracts [Member]
Derivatives, Fair Value [Line Items]
Total notional amount outstanding | gal	8,400,000
Granite Falls Energy, LLC [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 188,000
Granite Falls Energy, LLC [Member] | Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Total notional amount outstanding | bu	1,900,000
Derivative Liabilities, Current	$ 92,250	1,114
Granite Falls Energy, LLC [Member] | Ethanol Contracts [Member]
Derivatives, Fair Value [Line Items]
Total notional amount outstanding | gal	4,200,000
Derivative Assets, Current	$ 63,437
Heron Lake Bio-energy LLC [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 443,000
Heron Lake Bio-energy LLC [Member] | Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Total notional amount outstanding | bu	2,920,000
Derivative Assets, Current		$ 677,149
Derivative Liabilities, Current	$ 67,075
Heron Lake Bio-energy LLC [Member] | Ethanol Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 63,437