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Allowance For Doubtful Accounts For Trade Accounts Receivable
 3 Months Ended
Jan. 31, 2013
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 three months ended January 31, 2013 and 2012 follows:

    Three Months Ended  
    January 31,  
    2013     2012  
 
Balance at beginning of period $ 92,148   $ 145,616  
Bad debt recovery   (7,095 )   (8,644 )
Losses charged to allowance   387     —  
Balance at end of period $ 85,440   $ 136,972