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Stock-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 31, 2015
Jan. 31, 2015
Option activity [Line Items]    
Granted 51  
Weighted average grant date fair value $ 6.38  
Unrecognized compensation expense $ 700  
Unrecognized compensation expense recognized period 2 years 6 months 25 days  
Restricted Stock [Member]    
Option activity [Line Items]    
Unrecognized compensation expense $ 600  
Unrecognized compensation expense recognized period 2 years 6 months  
Stock Option [Member]    
Option activity [Line Items]    
Outstanding at beginning of year   764
Weighted Average Exercise Price Per Share   $ 11.45
Weighted Average Remaining Contractual Term   5 years 8 months 4 days
Options Outstanding Aggregate Intrinsic Value $ 1 $ 0
Granted 51  
Weighted average grant date fair value $ 6.38  
Expired or forfeited (59)  
Expired or Forfeited Weighted Average Exercise Price Per Share $ 10.08  
Outstanding end of period 756  
Outstanding Weighted Average Exercise Price Per Share $ 11.22  
Outstanding Weighted Average Remaining Contractual Term 5 years 8 months 4 days  
Exercisable end of period 566  
Exercisable Weighted Average Exercise Price Per Share $ 11.81  
Exercisable Weighted Average Remaining Contractual Term 4 years 8 months 4 days  
Exercisable Aggregate Intrinsic Value $ 0  
unvested option [Member]    
Option activity [Line Items]    
Outstanding at beginning of year 189 232
Weighted Average Exercise Price Per Share $ 9.44 $ 10.11
Options Outstanding Aggregate Intrinsic Value $ 0 $ 0
Vested (87)  
Expired or forfeited (7)  
Expired or Forfeited Weighted Average Exercise Price Per Share $ 10.24