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Purchased Intangible Assets (Details 1) (USD $)
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Schedule of Expected Amortization Expense      
2014 $ 243,000    
2015 243,000    
2016 243,000    
2017 243,000    
2018 243,000    
Thereafter 935,000    
Total $ 2,150,000 $ 2,393,000 $ 2,636,000