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Cash Dividend and Declared Dividends - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Dividends Payable [Line Items]        
Dividends paid, per share $ 0.050 $ 0.025 $ 0.150  
Dividends Paid $ 343,178 $ 172,287 $ 1,038,408 $ 387,608
Dividend payment first
       
Dividends Payable [Line Items]        
Dividends paid, per share       $ 0.015
Dividend payment second
       
Dividends Payable [Line Items]        
Dividends paid, per share       $ 0.020
Dividend payment third
       
Dividends Payable [Line Items]        
Dividends paid, per share       $ 0.025