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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
9 Months Ended
Jul. 31, 2015
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, 2015 and 2014 follows:
 
 
 
 
Nine Months Ended
 
 
 
July 31,
 
 
 
2015
 
 
2014
 
Balance at beginning of period
  $ 92,988     $ 74,073  
Bad debt expense (recovery)
    (14,203 )     18,655  
Losses charged to allowance
    (6,820 )      
Balance at end of period
  $ 71,965     $ 92,728