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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
3 Months Ended
Jan. 31, 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 three months ended January 31, 2016 and 2015 follows:
 
 
 
Three Months Ended
 
 
 
January 31,
 
 
 
2016
 
 
2015
 
Balance at beginning of period
  $ 63,011     $ 92,988  
Bad debt expense (recovery)
    7,075       (26,411 )
Losses charged to allowance
    -       (6,820 )
Balance at end of period
  $ 70,086     $ 59,757