Note 8 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Interest cost	$ 82	$ 96
Service cost	83	74
Recognized net actuarial loss	72	35
Net periodic pension cost	$ 237	$ 205