Income Taxes (Details Textual) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Income Taxes (Additional Textual) [Abstract]
Federal income tax expense	34.00%	35.00%	34.00%
Net reduction in consolidated income tax expenses	$ 141,000
Recognized tax benefit	3,300,000
Reversed estimates of potential penalties and interest	1,900,000
Associated excess tax benefit	420,000	778,000	(5,000)
Deferred tax asset				346,000
Unrecognized Tax Benefit	376,000	5,435,000
Accrued interest and penalties	376,000	2,135,000
Potential penalties and interest	93,000	578,000	256,000
Foreign Country [Member]
Income Taxes (Textual) [Abstract]
Tax credit carry forwards	$ 3,449,000
Tax credit carry forwards expiration year	2020