DEBT FACILITIES - Heron Lake BioEnergy (Details) - Heron Lake BioEnergy, LLC - USD ($)	Mar. 29, 2018	Mar. 01, 2015	Oct. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Feb. 28, 2015
Revolving term note payable to lending institution
Line of Credit Facility
Credit facility maximum	$ 4,000,000			$ 8,000,000		$ 28,000,000
Line of credit future reduction amounts		$ 3,500,000
Unused borrowing capacity			$ 4,000,000		$ 17,500,000
Interest rate (as a percent)			5.41%
Commitment fee (as a percent)	0.50%
CoBank
Line of Credit Facility
Annual fee	$ 2,500
Seasonal line of credit payable to lending institution
Line of Credit Facility
Credit facility maximum	$ 4,000,000
Unused borrowing capacity			$ 4,000,000
Interest rate (as a percent)			5.16%
Commitment fee (as a percent)	0.25%
One Month LIBOR | Revolving term note payable to lending institution
Line of Credit Facility
Spread above variable interest rate	3.10%
LIBOR | Seasonal line of credit payable to lending institution
Line of Credit Facility
Spread above variable interest rate	2.85%