Income Taxes (Details Textual) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Income Taxes (Textual) [Abstract]
Effective tax rate from continuing operation	35.00%
Income taxes paid	$ 3,743,000	$ 9,026,000	$ (709,000)
Net operating loss carryforward	170,233,000
Net operating loss carryforwards expiration dates	Years ending January 31, 2026 through January 31, 2032
Charitable contribution deduction carryforward	30,401,000
Charitable contribution deduction carryforward expiration dates	Years ending January 31, 2013 through January 31, 2017
General Business credits carryovers	20,212,000
General Business credits carryovers expiration dates	Years ending January 31, 2013 through January 31, 2032
Alternative Minimum Tax credits	27,452,000
Net deferred tax asset unrecognized	17,265,000
Unrecognized tax benefits	788,000	408,000	1,611,000
Accrued interest and penalties	154,000	100,000
Income tax expense (benefit)	54,000	(424,000)	61,000
Unrecognized tax benefits			174,000
Increase decrease in associated accrued interest and penalties			(59,000)
Effective unrecognized tax benefits	357,000	121,000
Unrecognized tax benefits could decrease during twelve month	$ 786,000