Stock-based compensation Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Option activity [Line Items]
Unrecognized compensation expense	$ 100
Unrecognized compensation expense recognized period	2 years
Restricted Stock [Member]
Option activity [Line Items]
Unrecognized compensation expense	$ 1,900
Unrecognized compensation expense recognized period	2 years 4 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	$ 274	$ 534
Options, exercises in period	(24)
Options, exercises in period, weighted average exercise price	$ 6.74
Options, exercises in period, intrinsic value	$ 29
Expired or forfeited	(82)
Expired or Forfeited Weighted Average Exercise Price Per Share	$ 23.49
Outstanding end of period	418
Outstanding Weighted Average Exercise Price Per Share	$ 9.49
Outstanding Weighted Average Remaining Contractual Term	4 years 5 months 30 days
Exercisable end of period	383
Exercisable Weighted Average Exercise Price Per Share	$ 9.59
Exercisable Weighted Average Remaining Contractual Term	4 years 2 months 30 days
Exercisable Aggregate Intrinsic Value	$ 249
unvested option [Member]
Option activity [Line Items]
Outstanding at beginning of year	35	74
Options, vested, number of shares	(32)
Weighted Average Exercise Price Per Share	$ 8.42	$ 9.31
Options Outstanding Aggregate Intrinsic Value	$ 25	$ 69
Expired or forfeited	(7)
Expired or Forfeited Weighted Average Exercise Price Per Share	$ 11.97