Stock Options and Employee Stock Purchase Plan (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Number of shares available for grant
Outstanding at beginning of year	785,547	764,718
Options granted	(192,850)	(201,551)
Options forfeited	89,618	42,226
Outstanding at end of year	846,280	785,547
Qualified Employee Stock Option Plans [Member]
Number of shares available for grant
Outstanding at beginning of year	151,883	327,300
Stockholder approval to increase shares	600,000
Options granted	(180,350)	(189,051)
Options forfeited	30,393	13,634
Outstanding at end of year	601,926	151,883
Director Stock Option Plans [Member]
Number of shares available for grant
Outstanding at beginning of year	7,000	19,500
Stockholder approval to increase shares	50,000
Options granted	(12,500)	(12,500)
Outstanding at end of year	44,500	7,000