Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2012	Jan. 31, 2012
Goodwill and Other Intangible Assets
Goodwill	$ 4,320	$ 4,320
Gross Carrying Amount	6,856	6,834
Accumulated Amortization	(2,671)	(2,138)
Amortizable intangible assets	4,185	4,696
Proprietary rights [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	7 years 7 months 6 days
Gross Carrying Amount	3,535	3,532
Accumulated Amortization	(1,564)	(1,347)
Amortizable intangible assets	1,971	2,185
Customer Relationships [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 3 months 18 days
Gross Carrying Amount	2,401	2,387
Accumulated Amortization	(800)	(572)
Amortizable intangible assets	1,601	1,815
Patents [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 3 months 18 days
Gross Carrying Amount	723	719
Accumulated Amortization	(241)	(172)
Amortizable intangible assets	482	547
Trade Names [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 3 months 18 days
Gross Carrying Amount	197	196
Accumulated Amortization	(66)	(47)
Amortizable intangible assets	$ 131	$ 149