Note 5 - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Share-based compensation expense	$ 867	$ 579	$ 2,115	$ 1,965
The above compensation is net of tax benefits	254	427	937	909
Share-based Payment Arrangement, Option [Member]
Share-based compensation expense	663	473	1,741	1,559
Stock Purchase Plan [Member]
Share-based compensation expense	187	89	324	355
Director Stock Award [Member]
Share-based compensation expense	17	16	50	48
Restricted Stock [Member]
Share-based compensation expense	$ 0	$ 1	$ 0	$ 3