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Securities Available for Sale (Details Textual) (USD $)	12 Months Ended
Securities Available for Sale (Details Textual) (USD $)	Jan. 31, 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	3 years

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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