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Note 7 - On-balance Sheet Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Jan. 31, 2018
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
Instrument   Notional Amount   Pay Rate   Receive Rate
Interest rate swap     $
3,866,668
    
1.25%
    
1.56%
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
    Before-Tax   Tax Benefit (Expense)   Net-of-Tax
Three Months Ended January 31, 2017
            
Gain on interest rate swap   $
15,121
     $
(6,048
 )   $
9,073
  
Reclassification adjustment to income    
7,015
      
(2,806
 )    
4,209
  
Net unrealized gain   $
22,136
     $
(8,854
 )   $
13,282
  
Three Months Ended January 31, 2018                        
Gain on interest rate swap   $
3,003
     $
(841
 )   $
2,162
  
Reclassification adjustment to income    
(1,692
 )    
474
      
(1,218
 )
Net unrealized gain   $
1,311
     $
(367
 )   $
944