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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 9 Months Ended
Jul. 31, 2017
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
nine
months ended
July 31, 2017
and
2016
follows:
 
 
 
Nine Months Ended
 
 
 
July 31,
 
 
 
2017
 
 
2016
 
Balance at beginning of period
   $
74,266
    $
63,011
 
Bad debt expense
   
6,161
     
23,074
 
Losses charged to allowance
    
(4,729
 )    
—
  
Recoveries added to allowance
    
129
     
—
  
Balance at end of period
   $
75,827
    $
86,085