Note 5 - Share-based Compensation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015
Employee Stock Option [Member]
Share-based compensation expense	$ 193	$ 264	$ (56)	$ 548
Stock Purchase Plan [Member]
Share-based compensation expense	60	50	152	197
Restricted Stock [Member]
Share-based compensation expense	1	2	2	3
Share-based compensation expense	254	316	98	748
The above compensation is net of tax benefits	$ 283,000	$ 169,000	$ 957,000	$ 261,000