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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Income Tax Expense (Benefit) $ 9,852 $ 1,567 $ (9,143) $ 2,979 $ 11,878 $ (2,317) $ (9,922) $ (5,304) $ 5,255 $ (5,665) $ (286,964)
Deferred Tax Assets, Valuation Allowance 627,943       635,305       $ 627,943 $ 635,305  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Refunds on Previous Taxes Paid, Percent                 (114.80%) 0.00% (9.80%)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 300       300       $ 300 $ 300  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                 (2) (91) $ (30)
Unrecognized Tax Benefits, Period Increase (Decrease)                 (200)    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,100       $ 1,100       $ 1,100 1,100  
Earliest Tax Year [Member]                      
Open Tax Year                 2012    
Latest Tax Year [Member]                      
Open Tax Year                 2015    
State and Local Jurisdiction [Member]                      
Income Tax Expense (Benefit)                 $ 2,457 4,293 (12,452)
Operating Loss Carryforwards 2,200,000               2,200,000    
Operating Income (Loss)                 16,400 12,300 24,500
Domestic Tax Authority [Member]                      
Income Tax Expense (Benefit)                 2,798 (9,958) (274,512)
Operating Loss Carryforwards $ 1,500,000               1,500,000    
Operating Income (Loss)                 $ 4,400 $ 3,700 $ 57,800