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DEBT FACILITIES - Granite Falls Energy (Details) - USD ($)
4 Months Ended 6 Months Ended 7 Months Ended
Oct. 01, 2020
Apr. 17, 2020
Sep. 08, 2017
Aug. 02, 2017
Sep. 01, 2014
Feb. 29, 2020
Apr. 30, 2020
Sep. 30, 2020
Oct. 31, 2019
Apr. 30, 2019
Aug. 31, 2014
Line of Credit Facility                      
Proceeds from long-term debt             $ 17,786,740        
Cash collateral (restricted cash)             351,068   $ 52,516 $ 399,875  
Loan received             1,299,593        
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        
Working capital covenants $ 10,000,000         $ 10,000,000   $ 9,000,000      
Interest rate (as a percent)             3.08%   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)             3.55%   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              
SBA Paycheck Protection Loan | Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC                      
Line of Credit Facility                      
Loan received   $ 703,900                  
Interest rate, stated percentage   1.00%                  
Repayment term   2 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