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Stock options Unvested options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Percentage of options expect to vest 90.00%  
unvested option [Member]    
Options, Nonvested, Number of Shares 31 74
Outstanding options, weighted Average grant date fair value $ 8.24 $ 9.31
Options, outstanding, intrinsic value $ 50 $ 69
Options granted in period, weighted avg date fair value $ 0.00 $ 7.33
Vested options in the period (36)  
Options, Forfeitures and Expirations in Period 7  
Options, Forfeitures and Expirations in Period, Weighted Average grant date fair value $ 10.43