Note 10 - Income Taxes - Deferred Tax Asset and Liability Components (Details) - USD ($)	Oct. 03, 2015	Sep. 27, 2014
Defined benefit plans	$ 3,755,000	$ 3,419,000
Accrued expenses and asset reserves	2,596,000	2,782,000
Stock-based compensation	2,054,000	1,804,000
State net operating loss carryforwards and tax credits	658,000	908,000
Goodwill, amortizable for tax purposes	559,000	870,000
Valuation allowance	(492,000)	(547,000)
Deferred tax assets	9,130,000	9,236,000
Plant and equipment	(12,285,000)	(12,654,000)
Prepaid insurance and other reserves	(1,410,000)	(1,032,000)
Deferred tax liabilities	(13,695,000)	(13,686,000)
Net deferred tax liability	$ (4,565,000)	$ (4,450,000)