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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 12 Months Ended
Oct. 31, 2018
Notes to Financial Statements  
Allowance for Doubtful Accounts for Trade Accounts Receivable Disclosure [Text Block]
(
2
)
Allowance for Doubtful Accounts for Trade Accounts Receivable
 
A summary of changes in the allowance for doubtful accounts for trade accounts receivable for the years ended
October 
31,
2018,
2017
and
2016
follows:
 
   
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