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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Jan. 31, 2013
Amortization expense related to amortizable intangible assets    
2014 $ 499  
2015 665  
2016 665  
2017 665  
2018 665  
2019 and thereafter 656  
Net Carrying Amount $ 3,815 $ 3,989