Note 10 - Income Taxes - Deferred Tax Asset and Liability Components (Details) - USD ($)	Oct. 01, 2016	Oct. 03, 2015
Defined benefit plans	$ 3,497,000	$ 3,755,000
Accrued expenses and asset reserves	2,942,000	2,596,000
Stock-based compensation	1,652,000	2,054,000
State net operating loss carryforwards and tax credits	354,000	658,000
Goodwill, amortizable for tax purposes	277,000	559,000
Valuation allowance	(280,000)	(492,000)
Deferred tax assets	8,442,000	9,130,000
Plant and equipment	(12,915,000)	(12,285,000)
Prepaid insurance and other reserves	(999,000)	(1,410,000)
Deferred tax liabilities	(13,914,000)	(13,695,000)
Net deferred tax liability	$ (5,472,000)	$ (4,565,000)