Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Schedule of Inventories
Raw materials	$ 3,103	$ 2,789
Finished goods	3,531	3,711
Work in progress	627	1,109
Cost of inventories	7,261	7,609
Less allowance for obsolescence	(1,073)	(901)
Net inventories	$ 6,188	$ 6,708