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Accounting Policies (Details) - Schedule of components of inventory (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jan. 31, 2013
Schedule of components of inventory [Abstract]
Ethanol and other finished goods	$ 6,982	$ 7,306
Work in process	4,483	4,414
Grain and other raw materials	17,907	13,199
Total	$ 29,372	$ 24,919

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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