Income Taxes (Details Textual) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2013
Income Taxes (Textual) [Abstract]
Federal corporate income tax rate	35.00%	34.00%
Accrued income taxes included in accrued expenses	$ 3,310,000		$ 1,362,000
Net deferred tax assets	$ 1,499,000		$ 1,639,000
Federal state and local income tax examination applicability description	no longer subject to federal ,state and local income tax examinations by tax authorities for its fiscal years ended on or before January 31, 2009