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Allowance For Doubtful Accounts For Trade Accounts Receivable
 6 Months Ended
Apr. 30, 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 six months ended April 30, 2013 and 2012 follows:

    Six Months Ended  
    April 30,  
    2013     2012  
 
Balance at beginning of period $ 92,148   $ 145,616  
Bad debt expense (recovery)   (17,756 )   13,947  
Losses charged to allowance   —     (30,411 )
Recoveries added to allowance   387     —  
Balance at end of period $ 74,779   $ 129,152