Note 10 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Pension plan settlement loss			$ 2,539
Pension Plan [Member]
Interest cost			147
Expected return on plan assets			(175)
Pension plan settlement loss			2,539
Amortization of net loss			76
Net periodic pension cost			2,587
Supplemental Employee Retirement Plan [Member]
Interest cost	345	338	326
Amortization of net loss	150	174	85
Net periodic pension cost	805	856	674
Service cost	$ 310	$ 344	$ 263