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Dividends declaration - Additional Information (Detail) (USD $)
12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Dividends Payable [Line Items]    
Dividends paid, per share $ 0.05  
Dividends Paid $ 1,386,751 $ 2,528,971
Dividend One
   
Dividends Payable [Line Items]    
Dividends paid, per share   $ 0.015
Dividend Two
   
Dividends Payable [Line Items]    
Dividends paid, per share   $ 0.02
Dividend Three
   
Dividends Payable [Line Items]    
Dividends paid, per share   $ 0.025
Dividend Four
   
Dividends Payable [Line Items]    
Dividends paid, per share   $ 0.05
Dividend Five
   
Dividends Payable [Line Items]    
Dividends paid, per share   $ 0.25