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Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Inventory Disclosure [Abstract]
Materials and Supplies	$ 11,430	$ 10,197
Work-In-Process	1,141	1,025
Finished Goods	8,152	7,491
Inventory, Gross	20,723	18,713
Inventory Reserve	(4,164)	(3,823)
Inventories	$ 16,559	$ 14,890

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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