Income Taxes (Details Textual) (USD $)	6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Income Taxes (Textual) [Abstract]
Federal statutory corporate income tax rate	35.00%	34.00%
Accrued income taxes included in accrued expenses	$ 278,000
Prepaid income taxes included in prepaid expenses and other current assets			1,602,000
Net deferred tax assets	$ 1,451,000,000,000		$ 1,529,000,000,000