Commitments and Contingencies (Details)	3 Months Ended
	Jan. 31, 2016 USD ($) bu
Granite Falls Energy, LLC [Member] | Ethanol Contracts [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 2,166,000
Revenue Concentration, Future Commitment	15.00%
Granite Falls Energy, LLC [Member] | Distillers Grains [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 666,000
Revenue Concentration, Future Commitment	43.00%
Granite Falls Energy, LLC [Member] | Grain Storage [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Construction in Progress, Bushels | bu	750,000
Construction in Progress, Gross	$ 2,700,000
Granite Falls Energy, LLC [Member] | Corn Contracts [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Inventory Dollars, Outside Storage	$ 1,300,000
Inventory, Outside storage | bu	380,000
Heron Lake Bioenergy [Member] | Corn Contracts [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Inventory, Outside storage | bu	4,597,000
Heron Lake Bioenergy [Member] | Ethanol Contracts [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 2,100,000
Revenue Concentration, Future Commitment	15.00%
Heron Lake Bioenergy [Member] | Distillers Grains [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 95,000
Revenue Concentration, Future Commitment	6.00%
Heron Lake Bioenergy [Member] | Regenerative Thermal Oxidizer RTO [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation, Down Payment	$ 375,000
Purchase Obligation	1,900,000
Granite Falls Energy [Member] | Corn Oil [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 217,000
Granite Falls Energy [Member] | Natural Gas [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future commitment, percent of anticipated usage	75.00%
Heron Lake Bioenergy [Member] | Corn Oil [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future Commitment, Dollar	$ 391,000