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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 6 Months Ended
Apr. 30, 2018
Notes to Financial Statements  
Allowance for Doubtful Accounts for Trade Accounts Receivable Disclosure [Text Block]
(
3
)
  Allowance for Doubtful Accounts for Trade Accounts Receivable
 
A summary of changes in the allowance for doubtful accounts for trade accounts receivable for the
six
months ended
April 30, 2018
and
2017
follows:
 
   
Six Months Ended
 
   
April 30,
 
   
2018
    
2017
  
Balance at beginning of period
   $
87,446
     $
74,266
  
Bad debt expense
    
4,856
      
11,169
  
Losses charged to allowance
    
(3,126
 )    
(4,729
 )
Balance at end of period
   $
89,176
     $
80,706