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Share Based Compensation (Details)
$ in Thousands
12 Months Ended
Jan. 31, 2018
USD ($)
Plans
Director
Award
shares
Jan. 31, 2017
USD ($)
shares
Jan. 31, 2016
USD ($)
May 22, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share based compensation plans | Plans 2      
Number of directors on Personnel and Compensation Committee | Director 2      
Number of award types | Award 2      
Granted, number of options (in shares) 85,800      
Award vesting period 4 years      
Expiration period 5 years      
Intrinsic value of options exercised | $ $ 1,036 $ 0 $ 172  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value | $ 1,312 $ 1,323 1,755  
Total compensation cost for non-vested awards not yet recognized in the Company's statements of income | $ $ 838      
Weighted average period to recognize costs associated with non-vested awards in years 1 year 11 months 4 days      
Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for grant under the plan 100,000      
Granted (in shares) 12,000      
stock unit to share conversion 1,000      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number 87,614 98,649    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period to recognize costs associated with non-vested awards in years 1 year 9 months 21 days      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, nonvested | $ $ 12,590      
Total unrecognized compensation cost net of estimated forfeitures | $ $ 3,054      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number 326,578      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, vested | $ $ 685 $ 754 1,437  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value | $ $ 678 $ 761 $ 1,411  
2010 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for grant under the plan       2,000,000
Remaining shares available for grant 1,163,074      
Maximum exercise period 10 years      
2010 Stock Incentive Plan | Time-vested RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 61,270      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number 146,849 126,729    
2010 Stock Incentive Plan | Performance-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 22,745      
Percentage of target award 100.00%      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number 179,729 146,519    
2010 Stock Incentive Plan | Performance-based Restricted Stock Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares target award 0.00%      
2010 Stock Incentive Plan | Performance-based Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares target award 150.00%