Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2012	Jan. 31, 2012
Goodwill and Other Intangible Assets
Gross Carrying Amount	$ 6,807	$ 6,834
Accumulated Amortization	(2,475)	(2,138)
Amortizable intangible assets	4,332	4,696
Goodwill	4,320	4,320
Proprietary rights [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	7 years 10 months 24 days
Gross Carrying Amount	3,491	3,532
Accumulated Amortization	(1,473)	(1,347)
Amortizable intangible assets	2,018	2,185
Customer Relationships [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 7 months 6 days
Gross Carrying Amount	2,397	2,387
Accumulated Amortization	(724)	(572)
Amortizable intangible assets	1,673	1,815
Patents [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 7 months 6 days
Gross Carrying Amount	722	719
Accumulated Amortization	(218)	(172)
Amortizable intangible assets	504	547
Trade Names [Member]
Goodwill and Other Intangible Assets
Useful life of intangible assets	5 years 7 months 6 days
Gross Carrying Amount	197	196
Accumulated Amortization	(60)	(47)
Amortizable intangible assets	$ 137	$ 149