Note 10 - Income Taxes - Deferred Tax Asset and Liability Components (Details) - USD ($)	Oct. 03, 2020	Sep. 28, 2019
Defined benefit plans	$ 2,727,000	$ 2,661,000
Accrued expenses and asset reserves	1,885,000	1,207,000
Stock-based compensation	1,328,000	1,259,000
Operating lease liability	568,000	0
State net operating loss carryforwards and tax credits	92,000	120,000
Federal net operating loss carryforward	0	363,000
Valuation allowance	(207,000)	(257,000)
Deferred tax assets	6,393,000	5,353,000
Plant and equipment	(10,766,000)	(10,625,000)
Prepaid insurance	(1,217,000)	(1,311,000)
Right of use assets	(566,000)	0
Goodwill	(412,000)	(317,000)
Deferred tax liabilities	(12,961,000)	(12,253,000)
Net deferred tax liability	$ (6,568,000)	$ (6,900,000)