Note 6 - Share-based Compensation and Post-retirement Benefits - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 24, 2023	Jun. 25, 2022	Jun. 24, 2023	Jun. 25, 2022
Employee share-based compensation	$ 1,078	$ 1,018	$ 3,325	$ 2,935
The above compensation is net of tax benefits	305	116	610	549
Share-Based Payment Arrangement, Option [Member]
Employee share-based compensation	449	693	1,628	2,115
Stock Purchase Plan [Member]
Employee share-based compensation	118	90	542	240
Stock Issued to Outside Directors [Member]
Employee share-based compensation	39	0	66	0
Restricted Stock Units (RSUs) [Member]
Employee share-based compensation	295	152	669	376
Performance Shares [Member]
Employee share-based compensation	$ 177	$ 83	$ 420	$ 204