Debt Facilities Long Term Debt (Details) - USD ($)	12 Months Ended
Oct. 31, 2015	Oct. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 7,229,932	$ 2,958,647
Long-term Debt, Current Maturities	(517,957)
Long-term Debt, Maturities, Repayments of Principal in Year Two	480,064
Long-term Debt, Maturities, Repayments of Principal in Year Three	432,182
Long-term Debt, Maturities, Repayments of Principal in Year Four	319,376
Long-term Debt, Maturities, Repayments of Principal in Year Five	326,798
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,153,555
Long-term Debt, less current portion	6,711,975	2,112,412
Current portion long-term debt	517,957	846,235
Granite Falls Energy [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		289,000
Line of Credit Facility, Amount Outstanding	0
Granite Falls Energy [Member] \| Revolving Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	18,000,000
Letters of Credit Reduction, Amount	2,000,000
Line of Credit Facility, Amount Outstanding	0	0
Heron Lake Bioenergy [Member] \| Corn Oil Separation [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 0	146,984
Debt Instrument, Interest Rate, Effective Percentage	5.57%
Debt Instrument, Periodic Payment	$ 40,000
Heron Lake Bioenergy [Member] \| Revolving Operating Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding		0
Heron Lake Bioenergy [Member] \| Water Assessment [Member]
Debt Instrument [Line Items]
Debt Payments, Semi-Annual Installments	189,393
Line of Credit Facility, Amount Outstanding	$ 1,775,828	2,018,767
Debt Instrument, Interest Rate, Effective Percentage	6.55%
Heron Lake Bioenergy [Member] \| Revolving Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 28,000,000
Letters of Credit Reduction, Amount	3,500,000
Heron Lake Bioenergy [Member] \| Water Treatment Plant [Member]
Debt Instrument [Line Items]
Debt Payments, Semi-Annual Installments	25,692
Line of Credit Facility, Amount Outstanding	$ 51,199	102,074
Debt Instrument, Interest Rate, Effective Percentage	0.50%
Heron Lake Bioenergy [Member] \| Water Supply [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 136,378	172,072
Debt Instrument, Interest Rate, Effective Percentage	8.73%
Debt Instrument, Periodic Payment	$ 3,942
Heron Lake Bioenergy [Member] \| Electrical Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	143,750	218,750
Agrinatural, LLC [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	300,000	$ 300,000
Agrinatural, LLC [Member] \| Natural Gas Pipeline Construction Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 4,822,777

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Letters of Credit Reduction, Amount

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments including both interest and principal payments.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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