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Allowance For Doubtful Accounts For Trade Accounts Receivable
 9 Months Ended
Jul. 31, 2013
Receivables [Abstract]  
Allowance For Doubtful Accounts For Trade Accounts Receivable
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, 2013 and 2012 follows: 
 
 
Nine Months Ended
 
 
July 31,
 
 
2013
 
2012
Balance at beginning of period
 
$
92,148

 
$
145,616

Bad debt expense (recovery)
 
42,929

 
(8,958
)
Losses charged to allowance
 
—

 
(34,577
)
Recoveries added to allowance
 
$
387

 
$
—

Balance at end of period
 
$
135,464

 
$
102,081