Stock-based compensation Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2017	Jan. 31, 2017
Option activity [Line Items]
Unrecognized compensation expense	$ 100
Unrecognized compensation expense recognized period	1 year 9 months 30 days
Restricted Stock [Member]
Option activity [Line Items]
Unrecognized compensation expense	$ 1,600
Unrecognized compensation expense recognized period	2 years 2 months 30 days
Stock Option [Member]
Option activity [Line Items]
Outstanding at beginning of year		524
Weighted Average Exercise Price Per Share		$ 11.55
Weighted Average Remaining Contractual Term		4 years 5 months 30 days
Options Outstanding Aggregate Intrinsic Value	$ 338	$ 534
Options, exercises in period	(30)
Options, exercises in period, weighted average exercise price	$ 6.77
Options, exercises in period, intrinsic value	$ 37
Expired or forfeited	(125)
Expired or Forfeited Weighted Average Exercise Price Per Share	$ 18.75
Outstanding end of period	369
Outstanding Weighted Average Exercise Price Per Share	$ 9.50
Outstanding Weighted Average Remaining Contractual Term	4 years 3 months 30 days
Exercisable end of period	335
Exercisable Weighted Average Exercise Price Per Share	$ 9.62
Exercisable Weighted Average Remaining Contractual Term	3 years 10 months 31 days
Exercisable Aggregate Intrinsic Value	$ 303
unvested option [Member]
Option activity [Line Items]
Outstanding at beginning of year	34	74
Options, vested, number of shares	(32)
Weighted Average Exercise Price Per Share	$ 8.32	$ 9.31
Options Outstanding Aggregate Intrinsic Value	$ 35	$ 69
Expired or forfeited	(8)
Expired or Forfeited Weighted Average Exercise Price Per Share	$ 11.49