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Valuation and Qualifying Accounts and Reserves Allowance for doubtful accounts (Details) (Allowance for Trade Receivables [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Jul. 31, 2012	Oct. 31, 2011
Allowance for Trade Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts, Beginning Balance	$ 16	$ 8
Adjustments to provision	(8)	8
Allowance for Doubtful Accounts, Ending Balance	$ 8	$ 16

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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