DEBT FACILITIES - Heron Lake BioEnergy (Details) - Heron Lake BioEnergy, LLC - USD ($)			12 Months Ended
	Mar. 29, 2018	Mar. 01, 2015	Oct. 31, 2019	Oct. 31, 2018	Dec. 31, 2017	Feb. 28, 2015
Amended revolving term note payable to lending institution
Line of Credit Facility
Credit facility maximum					$ 8,000,000	$ 28,000,000
Line of credit future reduction amounts		$ 3,500,000
2020 Credit Facility
Line of Credit Facility
Credit facility maximum			$ 8,000,000
Spread above variable interest rate			3.10%
Interest rate (as a percent)			4.87%
Line of credit unused commitment fee (as a percent)			0.50%
2020 Credit Facility | Amended revolving term note payable to lending institution
Line of Credit Facility
Credit facility maximum			$ 8,000,000
Line of credit unused commitment fee (as a percent)			0.50%
2020 Credit Facility | CoBank
Line of Credit Facility
Annual fee			$ 2,500
2018 Credit Facility | Amended revolving term note payable to lending institution
Line of Credit Facility
Credit facility maximum	$ 4,000,000
Unused borrowing capacity			$ 4,000,000	$ 4,000,000
Interest rate (as a percent)			4.87%
Commitment fee (as a percent)	0.50%
2018 Credit Facility | CoBank
Line of Credit Facility
Annual fee	$ 2,500
2018 Credit Facility | Seasonal revolving term loan
Line of Credit Facility
Credit facility maximum	$ 4,000,000
Unused borrowing capacity			$ 4,000,000	$ 4,000,000
Interest rate (as a percent)			4.62%
Commitment fee (as a percent)	0.25%
One Month LIBOR | 2020 Credit Facility | Amended revolving term note payable to lending institution
Line of Credit Facility
Spread above variable interest rate			3.10%
One Month LIBOR | 2018 Credit Facility | Amended revolving term note payable to lending institution
Line of Credit Facility
Spread above variable interest rate	3.10%
LIBOR | 2018 Credit Facility | Seasonal revolving term loan
Line of Credit Facility
Spread above variable interest rate	2.85%