Stock Options and Employee Stock Purchase Plan (Details 1) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Summary of option activity
Outstanding at beginning of year	785,547	764,718
Outstanding at beginning of year, Weighted average exercise price	$ 11.52	$ 10.98
Options granted	192,850	201,551
Weighted average exercise price, Granted	$ 9.03	$ 12.64
Options Exercised	(42,499)	(138,496)
Weighted average exercise price, Exercised	$ 5.75	$ 10.08
Options forfeited	(89,618)	(42,226)
Weighted average exercise price, Forfeited	$ 11.12	$ 11.69
Outstanding at end of year	846,280	785,547
Outstanding at end of year, Weighted average exercise price	$ 11.28	$ 11.52
Exercisable at end of year	555,135	535,668
Weighted average fair value of options granted during the year	$ 3.45	$ 5.39