Lease information Property under capitalized leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Property, Plant and Equipment [Line Items]
Capital leases vehicle equipment	$ 31	$ 42
Capitalized computer	92	92
Capital leased assets, gross	3,451	3,459
Capital leases other accumulated depreciation	871	546
Capital leases, net	2,580	2,913
Fixed assets acquired under capital leases	107	569
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Capital leases machinery and equipment	$ 3,328	$ 3,325