Income Taxes (Details 1) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Current:
Federal	$ 11,555,000	$ 3,771,000
State	2,224,000	836,000
Total	13,779,000	4,607,000
Deferred:
Federal	(207,000)	41,000
State	68,000	(92,000)
Total	(139,000)	(51,000)
Income tax expense	$ 13,640,000	$ 4,556,000