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Financing Arrangement (Details Textual) (USD $)
 9 Months Ended
Oct. 31, 2012
Jan. 31, 2012
Line of Credit Facility [Line Items]    
Maximum amount of line of credit $ 4,250,000  
Line of credit facilities (Textual) [Abstract]    
Interest rate on borrowings under the Line of Credit. LIBOR  
Borrowings outstanding under Bank financing arrangements 0 0
Expiration date of financing arrangements May 31, 2013  
Interest rate 2.25%  
Letter of Credit [Member]
    
Line of Credit Facility [Line Items]    
Maximum amount of letters of credit $ 10,000,000