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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)
 12 Months Ended
Oct. 31, 2018
Notes Tables  
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]
   
Years ended October 31,
 
   
2018
    
2017
    
2016
  
Balance at beginning of year
   $
87,446
     $
74,266
     $
63,011
  
Bad debt expense (recovery)
    
(18,455
 )    
21,569
      
11,255
  
Losses charged to allowance
    
(4,749
 )    
(8,389
 )    
—
  
Balance at end of year
   $
64,242
     $
87,446
     $
74,266