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Derivative Financial Instruments (Details) bu in Millions	3 Months Ended
	Apr. 30, 2021 USD ($) bu	Apr. 30, 2020 USD ($)	Jan. 31, 2021 USD ($) bu
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount	$ 1,717,000		$ 1,657,000
Gain (Loss) on Derivative Instruments, Net, Sales and Revenue	1,126,000	$ 0
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (1,894,000)	$ 3,144,000
Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels) | bu	9.5		6.4
Short/Sell [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity (in US Bushels) | bu	2.6		6.9

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Amount of assets pledged to secure a debt instrument.

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