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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 12 Months Ended
Oct. 31, 2016
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,
2016,
2015
and
2014
follows:
 
 
 
Years ended October 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Balance at beginning of year
   $
63,011
    $
92,988
    $
74,073
 
Bad debt expense (recovery)
    
11,255
     
(16,889
 )    
18,915
 
Losses charged to allowance
    
—
     
(13,088
 )    
—
 
Balance at end of year
   $
74,266
    $
63,011
    $
92,988