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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 12 Months Ended
Oct. 31, 2015
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, 2015, 2014 and 2013 follows:
 
   
Years ended October 31,
 
 
 
2015
 
 
2014
 
 
2013
  
Balance at beginning of year
   $ 92,988     $ 74,073     $ 92,148  
Bad debt expense (recovery)
     (16,889 )     18,915       20,461  
Losses charged to allowance
     (13,088 )     —       (38,922 )
Recoveries added to allowance
     —       —       386  
Balance at end of year
   $ 63,011     $ 92,988     $ 74,073