Common Stock Repurchase (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	May 02, 2017	Apr. 26, 2016	Oct. 28, 2014	Oct. 29, 2013
Shares repurchased, value		$ 938,000	$ 550,000	$ 2,339,000
October 2013 authorized repurchase program
Stock repurchase program, authorized amount								$ 20,000,000
Shares repurchased	287,787
Shares repurchased, value	$ 2,200,000
October 2014 authorized repurchase program
Stock repurchase program, authorized amount							$ 15,000,000
Shares repurchased			0
April 2016 authorized repurchase program
Stock repurchase program, authorized amount						$ 15,000,000
Shares repurchased		0
May 2017 authorized repurchase program
Stock repurchase program, authorized amount					$ 20,000,000
Shares repurchased		28,691
Shares repurchased, value		$ 300,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 19,700,000