Stock options Unvested options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Percentage of options expect to vest	85.00%
unvested option [Member]
Options, Nonvested, Number of Shares	74	166
Outstanding Options, Weighted Average grant date fair value	$ 9.31	$ 9.51
Options, Outstanding, Intrinsic Value	$ 69	$ 3
Options granted in period, weighted avg date fair value	$ 7.33	$ 6.38
Vested options in the period	(72)
Options, Forfeitures and Expirations in Period	42
Options, Forfeitures and Expirations in Period, Weighted Average grant date fair value	$ 8.98