Note 10 - Income Taxes - Deferred Tax Asset and Liability Components (Details) - USD ($)	Sep. 27, 2025	Sep. 28, 2024
Defined benefit plans	$ 2,682,000	$ 2,765,000
Accrued expenses and asset reserves	2,342,000	1,406,000
Stock-based compensation	1,650,000	1,423,000
R & E Capitalization	335,000	226,000
Operating lease liabilities	873,000	378,000
State net operating loss carryforwards and tax credits	3,000	3,000
Valuation allowance	(112,000)	(149,000)
Deferred tax assets	7,773,000	6,052,000
Plant and equipment	(15,374,000)	(15,090,000)
Prepaid insurance	(1,112,000)	(1,240,000)
Right-of-use assets	(881,000)	(381,000)
Goodwill	(1,474,000)	(976,000)
Deferred tax liabilities	(18,841,000)	(17,687,000)
Net deferred tax liability	$ (11,068,000)	$ (11,635,000)