Valuation and Qualifying Accounts (Details) (Accounts receivable reserve [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Accounts receivable reserve [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 90	$ 105		$ 105
Additions Deductions Balance at Beginning of Period Charged to Costs and Expenses	23	1	29
Deductions Write-offs	28	16	29
Balance at End of Period	$ 85	$ 90	$ 105	$ 105