Note 8 - 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
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Interest cost	$ 96	$ 86	$ 288	$ 258
Service cost	74	70	222	209
Recognized net actuarial loss	35	38	105	114
Net periodic pension cost	$ 205	$ 194	$ 615	$ 581