Significant accounting policies Inventories (Tables)

12 Months Ended

Jan. 31, 2017

Inventories [Abstract]

Schedule of Inventory, Current [Table Text Block]

	2016	2015
Raw materials	$13,648	$15,291
Work in process	1,105	1,168
Finished goods	836	722
Subtotal	15,589	17,181
Less allowance	2,024	1,556
Inventories	$13,565	$15,625