Note 10 - Income Taxes - Deferred Tax Asset and Liability Components (Details) - USD ($)	Oct. 02, 2021	Oct. 03, 2020
Defined benefit plans	$ 2,921,000	$ 2,727,000
Accrued expenses and asset reserves	2,280,000	1,885,000
Stock-based compensation	1,204,000	1,328,000
Operating lease liability	387,000	568,000
State net operating loss carryforwards and tax credits	54,000	92,000
Valuation allowance	(73,000)	(207,000)
Deferred tax assets	6,773,000	6,393,000
Plant and equipment	(10,901,000)	(10,766,000)
Prepaid insurance	(1,374,000)	(1,217,000)
Right of use assets	(385,000)	(566,000)
Goodwill	(409,000)	(412,000)
Deferred tax liabilities	(13,069,000)	(12,961,000)
Net deferred tax liability	$ (6,296,000)	$ (6,568,000)