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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 12 Months Ended
Oct. 31, 2017
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,
2017,
2016
and
2015
follows:
 
   
Years ended October 31,
  
   
2017
    
2016
    
2015
  
Balance at beginning of year
   $
74,266
     $
63,011
     $
92,988
  
Bad debt expense (recovery)
    
21,569
      
11,255
      
(16,889
 )
Losses charged to allowance
    
(8,389
 )    
—
      
(13,088
 )
Balance at end of year
   $
87,446
     $
74,266
     $
63,011