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Equity investments (Details) (USD $)
12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Versa [Member]
Oct. 31, 2010
Versa [Member]
Oct. 31, 2009
Versa [Member]
Oct. 31, 2007
Versa [Member]
Oct. 31, 2012
Versa [Member]
Schedule of Equity Method Investments [Line Items]                
Shares of Versa Common Stock Available for Purchase if Warrants Exercised               $ 4,830
Equity Method Investment, Ownership Percentage Increase if Warrants Exercised 43.00%              
Fair Value of Warrants $ 100,000 $ 200,000            
Weighted Average Price Per Share for Common Stock if Warrants Exercised $ 157              
Proceeds from (Repayments of) Debt 0 4,000,000 0 600,000 600,000 600,000 2,000,000  
Equity Method Investment, Ownership Percentage 39.00%              
Impairment of equity investment 3,602,000 0 0          
Noncontrolling Interest, Ownership Percentage by Controlling Owners 61.00%              
Investments in and Advances to Affiliates, Amount of Equity $ 6,115,000 $ 10,466,000