Balance Sheet (Details 1) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Jan. 31, 2012
Inventories:
Raw materials	$ 3,116	$ 2,789
Finished goods	4,989	3,711
Work in progress	519	1,109
Total inventories, gross	8,624	7,609
Less allowance for obsolescence	(1,100)	(901)
Total inventories, net	$ 7,524	$ 6,708