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Income Taxes (Details Textual) (USD $)
 3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Income Taxes (Textual) [Abstract]    
Income tax expense $ (400,000) $ (400,000)
Valuation allowance recorded against the net deferred tax assets generated from loss for period 18,300,000 45,100,000
Net deferred tax assets 1,100,000 1,100,000
Valuation allowance 866,100,000 847,800,000
Additions to total gross unrecognized tax benefits 0  
Total amount of unrecognized tax benefits, including interest and penalties 1,900,000  
Net Increase (reduction) in valuation allowance 18,300,000  
Maximum [Member]
    
Income Tax Contingency [Line Items]    
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date 0  
Minimum [Member]
    
Income Tax Contingency [Line Items]    
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date $ 500,000