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Line of Credit (Details) (USD $)
12 Months Ended
Jan. 31, 2012
Jan. 31, 2013
Revolving line of credit [Member]
Jan. 31, 2012
Revolving line of credit [Member]
Line of Credit (Textual) [Abstract]      
Revolving line of credit   $ 0 $ 5,000,000
Line of credit basis spread on base rate 0.75%    
Line of credit basis spread on London interbank offered rate 1.50%