Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2013 Proprietary rights [Member]	Jan. 31, 2012 Proprietary rights [Member]	Jan. 31, 2013 Customer Relationships [Member]	Jan. 31, 2012 Customer Relationships [Member]	Jan. 31, 2013 Patents [Member]	Jan. 31, 2012 Patents [Member]	Jan. 31, 2013 Trade Names [Member]	Jan. 31, 2012 Trade Names [Member]
Goodwill and Other Intangible Assets
Goodwill	$ 4,320	$ 4,320	$ 4,320
Useful life of intangible assets				7 years 4 months 24 days		5 years 1 month 6 days		5 years 1 month 6 days		5 years 1 month 6 days
Gross Carrying Amount	6,826	6,834		3,503	3,532	2,402	2,387	724	719	197	196
Accumulated Amortization	(2,837)	(2,138)		(1,625)	(1,347)	(876)	(572)	(264)	(172)	(72)	(47)
Net Carrying Amount	$ 3,989	$ 4,696		$ 1,878	$ 2,185	$ 1,526	$ 1,815	$ 460	$ 547	$ 125	$ 149