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Securities Available for Sale (Details Textual) (USD $)
3 Months Ended
May 04, 2013
Securities Available for Sale (Textual) [Abstract]  
Short-term investment securities have original maturities greater than (days) 90 days
Impairment charges on available for sale security $ 0
Minimum [Member]
 
Securities Available for Sale (Textual) [Abstract]  
Anticipated maturity dates range 1 month
Maximum [Member]
 
Securities Available for Sale (Textual) [Abstract]  
Anticipated maturity dates range 26 months