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DEBT FACILITIES - Granite Falls Energy (Details) - USD ($)
Jun. 10, 2019
Sep. 08, 2017
Aug. 02, 2017
Nov. 01, 2016
Sep. 01, 2014
Jul. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Aug. 31, 2014
Line of Credit Facility                  
Cash collateral (restricted cash)           $ 113,807   $ 132,914  
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC                  
Line of Credit Facility                  
Cash collateral (restricted cash)             $ 0    
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        
Amounts outstanding under the credit facility   $ 0              
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)           4.99% 5.06%    
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                  
Amounts outstanding under the credit facility           7,500,000      
Proceeds from long-term debt     $ 7,500,000            
Principal installment monthly           $ 89,000      
Interest rate (as a percent)           5.29% 5.36%    
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 | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC                  
Line of Credit Facility                  
Units purchased 100     1,500          
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