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Accounting Policies (Details)	9 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Jan. 31, 2016 USD ($)
Accounting Policies (Details) [Line Items]
Income Taxes Paid	$ 5,060,000	$ 19,703,000
Proceeds from Income Tax Refunds	0	132,000
Unrecognized Tax Benefits	2,029,000		$ 987,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	198,000		$ 0
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 1,319,000
Property, Plant and Equipment, Depreciation Methods	Depreciation is computed using the straight-line method.
Impairment of Real Estate	$ 0	$ 125,000
Number of Ethanol Entities Under Majority Ownership Interest	2
Minimum [Member] | Building and Building Improvements [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Minimum [Member] | Fixtures And Equipment [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member] | Building and Building Improvements [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Fixtures And Equipment [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Cost of Sales [Member]
Accounting Policies (Details) [Line Items]
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting	20.00%

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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