Note 11 - Employee Benefit Plans - Projected Benefit Obligation Reconciliation for SERP (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Benefit obligation	$ 11,278	$ 9,749	$ 9,389
Service cost	338	297	310
Interest cost	334	384	345
Actuarial loss (gain)	(91)	1,133	(33)
Distributions	(249)	(285)	(262)
Benefit obligation	11,610	11,278	9,749
Actual employer contributions	249	285	262
Actual distributions	(249)	(285)	(262)
Fair value of plan assets	0	0	0
Funded status	(11,610)	(11,278)	(9,749)
Net amount recognized	(11,610)	(11,278)	(9,749)
Unrecognized net loss	2,574	2,958	1,966
Net amount recognized	2,574	2,958	1,966
Net loss (gain)	(91)	1,133	(33)
Amortization of net loss	(294)	(140)	(150)
Total recognized in other comprehensive income (loss)	$ (385)	$ 993	$ (183)