Stock options Option activity (Details) - Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Share-based compensation
Options, vested and expected to vest, outstanding, number	358	524	720
Outstanding options, weighted Average grant date fair value	$ 9.44	$ 11.55	$ 11.38
Options, vested and expected to vest, outstanding, weighted average remaining contractual term	4 years	4 years 6 months 1 day	5 years 1 month 6 days
Options, outstanding, intrinsic value	$ 482	$ 534	$ 34
Options exercisable	327	450
Options exercisable, weighted average exercise price	$ 9.56	$ 11.92
Options exercisable, weighted average remaining contractual term	3 years 8 months	3 years 10 months 30 days
Options exercisable, intrinsic value	$ 433	$ 465
Options, grants	0	22
Shares exercised	(35)	(59)
Options exercises, weighted average exercise price	$ 6.80	$ 6.70
Options exercised, intrinsic value	$ 45	$ 68
Canceled options during the year	(131)	(159)
Options, forfeitures and expirations, weighted average exercise price	$ 18.54	$ 11.98