Income Taxes (Details) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Company's income tax expense relating to continuing operations
Computed expected income tax expense	$ 3,801,000	$ 2,402,000
State income taxes, net of federal tax benefit	332,000	276,000
Permanent differences, net	(237,000)	(162,000)
Other, net	24,000	1,000
Total	$ 3,920,000	$ 2,517,000