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Balance Sheet - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Jan. 31, 2014
Inventories:
Raw materials	$ 4,335	$ 4,599
Finished goods	4,214	4,159
Work in progress	828	612
Cost of inventories	9,377	9,370
Less allowance for obsolescence	(1,075)	(1,032)
Total inventories, net	$ 8,302	$ 8,338

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