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Derivative Instrument Asset & Liabilities (Details) - USD ($)	Oct. 31, 2015	Oct. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 677,149	$ 1,295,738
Derivative Liabilities, Current	(1,114)	0
Granite Falls Energy [Member] \| Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	0	858,238
Derivative Liabilities, Current	(1,114)	0
Heron Lake Bio-energy LLC [Member] \| Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	677,149	437,500
Derivative Liabilities, Current	$ 0	0
Margin requirements [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current		492,000
Margin requirements [Member] \| Granite Falls Energy [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current		228,000
Margin requirements [Member] \| Heron Lake Bio-energy LLC [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current		$ 264,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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