Significant accounting policies Inventories (Tables)

12 Months Ended

Jan. 31, 2013

Inventories [Abstract]

Schedule of Inventory, Current [Table Text Block]

	2012	2011
Raw materials	$35,145	$33,402
Work in process	3,506	2,927
Finished goods	4,476	4,715
Subtotal	43,127	41,044
Less allowances	794	840
Inventories, net	$42,333	$40,204