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Employee Benefits (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2012
Restricted Stock Awards [Member]
Oct. 31, 2011
Restricted Stock Awards [Member]
Oct. 31, 2010
Restricted Stock Awards [Member]
Jul. 31, 2012
Restricted Stock Awards [Member]
Maximum [Member]
Oct. 31, 2012
2005 Stock Incentive Plan [Member]
Oct. 31, 2012
2011 Stock Incentive Plan [Member]
Oct. 31, 2012
Non-employee Directors Stock Plan [Member]
Oct. 31, 2012
Non-employee Directors Stock Plan [Member]
Restricted Stock Awards [Member]
Oct. 31, 2011
Non-employee Directors Stock Plan [Member]
Restricted Stock Awards [Member]
Oct. 31, 2010
Non-employee Directors Stock Plan [Member]
Restricted Stock Awards [Member]
Oct. 31, 2012
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Health insurance coverage expense $ 3,303,968 $ 3,073,366 $ 2,604,225                      
Matching 401(k) contributions 229,417 83,245 76,583                      
Shares authorized and reserved for common stock issuance               1,000,000 500,000 250,000        
Shares available for grant               20,000 127,000 66,000        
Share-based compensation expense 1,440,534 893,354 942,711                      
Share-based compensation expense for employees       1,287,271 746,431 870,473                
Share-based compensation expense for non-employee directors                     153,263 146,923 72,238  
Restricted share grants                     44,424 30,356 22,860  
Compensation cost related to unvested equity-based compensation, period (in years)       2 years 8 months 12 days                    
Compensation cost related to unvested equity-based compensation             $ 1,600,000              
Options to purchase                           3,123
Exercise price                           $ 7.12
Vesting period                           1 month