Common Stock Repurchase (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Apr. 26, 2016	Oct. 28, 2014	Oct. 29, 2013
Shares repurchased, value		$ 550,000	$ 2,339,000	$ 15,802,000
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