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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)
9 Months Ended
Jul. 31, 2018
Notes Tables  
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]
   
Nine Months Ended
 
   
July 31,
 
   
2018
   
2017
 
Balance at beginning of period
  $
87,446
    $
74,266
 
Bad debt expense (recovery)
   
(29,247
)    
6,161
 
Losses charged to allowance
   
(4,648
)    
(4,729
)
Recoveries added to allowance
   
-
     
129
 
Balance at end of period
  $
53,551
    $
75,827