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Derivative Instrument Asset And Liabilities (Details) - USD ($)
Jan. 31, 2016
Oct. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current $ 171,813 $ 677,149
Derivative Liabilities, Current   1,114
Granite Falls Energy, LLC [Member]    
Derivatives, Fair Value [Line Items]    
Restricted Cash and Cash Equivalents, Current 49,000  
Granite Falls Energy, LLC [Member] | Corn Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 30,700  
Derivative Liabilities, Current   1,114
Granite Falls Energy, LLC [Member] | Ethanol Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 14,875  
Heron Lake Bio-energy LLC [Member]    
Derivatives, Fair Value [Line Items]    
Restricted Cash and Cash Equivalents, Current 363,000  
Heron Lake Bio-energy LLC [Member] | Corn Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 111,363 $ 677,149
Heron Lake Bio-energy LLC [Member] | Ethanol Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current $ 14,875