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DEBT FACILITIES - Granite Falls Energy (Details) - USD ($)
Sep. 08, 2017
Aug. 02, 2017
Nov. 01, 2016
Sep. 01, 2014
Apr. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Aug. 31, 2014
Line of Credit Facility                
Cash collateral (restricted cash)         $ 399,875   $ 1,355,872  
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)         5.23% 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            
Interest rate (as a percent)         5.53% 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     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