Debt Facilities Narrative (Details) - USD ($)	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Line of Credit Facility [Line Items]
Long-term Debt	$ 7,229,932	$ 2,958,647
Debt Instrument, Unused Borrowing Capacity, Amount	12,000,000
Heron Lake Bioenergy [Member] | Revolving Operating Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding		0
Heron Lake Bioenergy [Member] | Revolving Term Loan [Member]
Line of Credit Facility [Line Items]
Long-term Debt	28,000,000
Letters of Credit Reduction, Amount	3,500,000
Debt Instrument, Unused Borrowing Capacity, Amount	24,500,000
Debt Instrument, Fee Amount	2,500
Agrinatural, LLC [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	300,000	300,000
Agrinatural, LLC [Member] | Natural Gas Pipeline Construction Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	4,822,777
Granite Falls Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	0
Letters of Credit Outstanding, Amount		289,000
Granite Falls Energy [Member] | Revolving Term Loan [Member]
Line of Credit Facility [Line Items]
Long-term Debt	18,000,000
Letters of Credit Reduction, Amount	2,000,000
Line of Credit Facility, Amount Outstanding	$ 0	$ 0
Minimum [Member] | Heron Lake Bioenergy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate Description	LIBOR
Debt Instrument, Interest Rate, Stated Percentage	3.45%	3.41%
Line of Credit Facility, Commitment Fee Percentage	0.50%
Minimum [Member] | Granite Falls Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate Description	LIBOR
Maximum [Member] | Heron Lake Bioenergy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate Description	0.0325
Maximum [Member] | Granite Falls Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate Description	0.0305