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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
6 Months Ended
Apr. 30, 2016
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 six months ended April 30, 2016 and 2015 follows:
 
 
 
Six Months Ended
 
 
 
April 30,
 
 
 
2016
 
 
2015
 
Balance at beginning of period
  $ 63,011     $ 92,988  
Bad debt expense (recovery)
    12,019       (17,264 )
Losses charged to allowance
    -       (6,820 )
Balance at end of period
  $ 75,030     $ 68,904