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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 31, 2013
Jan. 31, 2013
Goodwill and Other Intangible Assets    
Goodwill $ 4,320 $ 4,320
Gross Carrying Amount 6,672 6,826
Accumulated Amortization (3,085) (2,837)
Net Carrying Amount 3,587 3,989
Proprietary rights [Member]
    
Goodwill and Other Intangible Assets    
Weighted Average Remaining Life 6 years 10 months 24 days  
Gross Carrying Amount 3,444 3,503
Accumulated Amortization (1,708) (1,625)
Net Carrying Amount 1,736 1,878
Customer relationships [Member]
    
Goodwill and Other Intangible Assets    
Weighted Average Remaining Life 4 years 7 months 6 days  
Gross Carrying Amount 2,333 2,402
Accumulated Amortization (996) (876)
Net Carrying Amount 1,337 1,526
Patents [Member]
    
Goodwill and Other Intangible Assets    
Weighted Average Remaining Life 4 years 7 months 6 days  
Gross Carrying Amount 703 724
Accumulated Amortization (300) (264)
Net Carrying Amount 403 460
Trade name [Member]
    
Goodwill and Other Intangible Assets    
Weighted Average Remaining Life 4 years 7 months 6 days  
Gross Carrying Amount 192 197
Accumulated Amortization (81) (72)
Net Carrying Amount $ 111 $ 125