Note 5 - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 25, 2017	Mar. 26, 2016	Mar. 25, 2017	Mar. 26, 2016
Share-based compensation expense	$ 156	$ 254	$ 120	$ 98
The above compensation is net of tax benefits	526	283	1,309	957
Employee Stock Option [Member]
Share-based compensation expense	66	193	(145)	(56)
Stock Purchase Plan [Member]
Share-based compensation expense	61	60	235	152
Deferred Stock Issued To Outside Directors [Member]
Share-based compensation expense	28		28
Restricted Stock [Member]
Share-based compensation expense	$ 1	$ 1	$ 2	$ 2