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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 3 Months Ended
Jan. 31, 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
three
months ended
January 31, 2018
and
2017
follows:
 
   
Three Months Ended
 
   
January 31,
  
   
2018
    
2017
  
Balance at beginning of period
   $
87,446
     $
74,266
  
Bad debt expense (recovery)
    
23,489
      
(568
 )
Losses charged to allowance
    
(3,127
 )    
(4,729
 )
Balance at end of period
   $
107,808
     $
68,969