Derivative Instrument Asset & Liabilities (Details) (USD $)	Oct. 31, 2014	Oct. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 1,295,738us-gaap_DerivativeAssetsCurrent	$ 0us-gaap_DerivativeAssetsCurrent
Derivative Liabilities, Current	0us-gaap_DerivativeLiabilitiesCurrent	(75,113)us-gaap_DerivativeLiabilitiesCurrent
Granite Falls Energy [Member] \| Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	858,238	0
Derivative Liabilities, Current	0	(75,113)
Heron Lake Bio-energy LLC [Member] \| Corn Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	437,500
Derivative Liabilities, Current	0
Margin requirements [Member]
Derivatives, Fair Value [Line Items]
Restricted Cash and Cash Equivalents, Current	492,000	394,000
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 asset or other 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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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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- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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