Note 5 - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021
Employee share-based compensation	$ 921	$ 580	$ 1,917	$ 1,404
The above compensation is net of tax benefits	346	446	433	866
Share-Based Payment Arrangement, Option [Member]
Employee share-based compensation	586	447	1,400	993
Stock Purchase Plan [Member]
Employee share-based compensation	90	64	150	342
Stock Issued to Outside Directors [Member]
Employee share-based compensation	11	22	22	22
Restricted Stock Units (RSUs) [Member]
Employee share-based compensation	152	47	224	47
Performance Shares [Member]
Employee share-based compensation	$ 82	$ 0	$ 121	$ 0