Note 12 - Income Taxes (Detail) (USD $)	3 Months Ended									12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Apr. 30, 2010	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Jan. 31, 2010
Income Tax Expense (Benefit)	$ 203,000	$ (36,493,000)	$ 536,000	$ 703,000	$ 580,000	$ (4,645,000)	$ (1,015,000)	$ (421,000)		$ (35,051,000)	$ (5,501,000)	$ (297,870,000)
Income Taxes Receivable													291,300,000
Proceeds from Income Tax Refunds								(17,200,000)	(274,100,000)
Loss Position, Duration	3 years									3 years
Valuation Allowance, Deferred Tax Asset, Change in Amount										38,500,000
Deferred Tax Assets, Valuation Allowance	937,881,000				899,414,000					937,881,000	899,414,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	400,000				18,800,000					400,000	18,800,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Change	9,300,000									9,300,000
Unrecognized Tax Benefits	9,900,000				26,800,000					9,900,000	26,800,000	23,000,000
State and Local Jurisdiction [Member] | Included in Curent Income Tax Expense (Benefit) [Member]
Operating Loss Carryforwards	3,400,000				500,000					3,400,000	500,000	400,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	2,300,000,000									2,300,000,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 1,500,000,000									$ 1,500,000,000