Balance Sheet (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Inventories:
Raw materials	$ 3,153	$ 3,103
Finished goods	4,191	3,531
Work in progress	1,220	627
Total inventories, gross	8,564	7,261
Less allowance for obsolescence	(1,119)	(1,073)
Total inventories, net	$ 7,445	$ 6,188

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details