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Shareholders' Equity (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Jul. 16, 2012
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
item
Oct. 31, 2011
Oct. 31, 2010
Sep. 20, 2012
Number of shares authorized to be repurchased                         320,000
Outstanding common stock remaining to be repurchased   253,000               253,000      
Purchase and retire percentage of shares in common stock outstanding                         4.90%
Shares repurchased and retired                   267,000 183,025 142,823  
Costs associated with the repurchase, including brokerage and legal fees                   $ 1,176,661 $ 846,287 $ 425,345  
Minimum percentage of stock owner in stockholder protection rights agreement                   15.00%      
Cash dividends declared per common share $ 0.01 $ 0.015 $ 0.015 $ 0.015 $ 0.015 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.06 $ 0.04 $ 0.01  
Preferred shares, exercise price                   $ 25      
Preferred shares, number of votes                   1,000      
Dividend rate, percentage above common stock                   1000.00%      
Preferred shares, rights expiration date                   Nov. 02, 2021      
Preferred shares, rights redemption price   $ 0.0001               $ 0.0001      
Preferred shares reserved for issuance upon exercise of rights   100,000               100,000      
Subsequent Event [Member]
                          
Shares repurchased and retired                   106,500      
Costs associated with the repurchase, including brokerage and legal fees                   $ 454,830      
Costs associated with the repurchase, including brokerage and legal fees, per share                   $ 4.27