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Financing Arrangement (Details Textual) (USD $)
 6 Months Ended
Jul. 31, 2012
Jan. 31, 2012
Line of Credit Facility [Line Items]    
Maximum Amount of Letters of Credit $ 4,250,000  
Line of credit facilities (Textual) [Abstract]    
Interest rate at Libor LIBOR plus 2.25%  
Borrowings outstanding under Bank financing arrangements 0 0
Expiration date of financing arrangements May 31, 2013  
Letter of Credit [Member]
    
Line of Credit Facility [Line Items]    
Maximum Amount of Letters of Credit $ 10,000,000