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DEBT FACILITIES - Granite Falls Energy (Details) - USD ($)
3 Months Ended
Sep. 08, 2017
Aug. 02, 2017
Sep. 01, 2014
Jan. 31, 2020
Oct. 31, 2019
Jan. 31, 2019
Aug. 31, 2014
Line of Credit Facility              
Proceeds from long-term debt       $ 7,039,706      
Cash collateral (restricted cash)       42,221 $ 52,516 $ 290,209  
Revolving term loan facility | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Credit facility maximum             $ 18,000,000
Line of credit future reduction amounts     $ 2,000,000        
Seasonal revolving term loan | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Credit facility maximum $ 6,000,000            
Amounts outstanding under the credit facility       0      
Aggregate principal amount available for borrowing       $ 6,000,000      
Interest rate (as a percent)       4.41% 4.52%    
Seasonal revolving term loan | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Proposed plan              
Line of Credit Facility              
Cash collateral (restricted cash)       $ 0      
Term note payable to Project Hawkeye | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Proceeds from long-term debt   $ 7,500,000          
Interest rate (as a percent)       4.78% 4.82%    
Interest rate floor (as a percent)   3.55%          
Maximum period of annual interest payments only   2 years          
Debt instrument amortization period after first two years   7 years          
One Month LIBOR | Seasonal revolving term loan | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Spread above variable interest rate 2.75%            
One Month LIBOR | Term note payable to Project Hawkeye | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Spread above variable interest rate   3.05%          
Ringneck Energy and; Feed, LLC | Term note payable to Project Hawkeye | Equity securities | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC              
Line of Credit Facility              
Units purchased   1,500