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Allowance For Doubtful Accounts For Trade Accounts Receivable
9 Months Ended
Jul. 31, 2012
Allowance For Doubtful Accounts For Trade Accounts Receivable [Abstract]  
Allowance For Doubtful Accounts For Trade Accounts Receivable

(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, 2012 and 2011 follows:

    Nine Months Ended  
    July 31,  
    2012     2011  
 
Balance at beginning of period $ 145,616   $ 120,450  
Bad debt expense (recovery)   (8,958 )   21,831  
Losses charged to allowance   (34,577 )   (3,930 )
Balance at end of period $ 102,081   $ 138,351