Note 9 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Interest cost	$ 79	$ 82	$ 237	$ 249
Service cost	78	83	234	245
Recognized net actuarial loss	54	72	162	212
Net periodic pension cost	$ 211	$ 237	$ 633	$ 706