Cash, Cash Equivalents and Restricted Cash (Details) (USD $)	12 Months Ended
Jan. 31, 2013	Jan. 31, 2012
Cash, Cash Equivalents and Restricted Cash (Textual) [Abstract]
Original Maturity date	Three months or less
Restricted cash released		$ 1,243,000
Minimum percentage of cash and cash equivalents invested in U.S. Treasury obligations and repurchase agreements	80.00%

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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