Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Additional costs inventoried for tax purposes and inventory adjustments not deductible for tax purposes	$ 725	$ 1,077
Excess benefit plan	1,067	1,005
Accrued pension costs	769	689
Net operating loss carryforward		1,315
Other	1,543	1,548
Current Deferred Tax Assets, Gross	4,104	5,634
Less Valuation Allowance	(687)	(1,428)
Current Deferred Tax Assets	3,417	4,206
Intangible assets		212
Accrued warranty costs	658	733
Foreign tax credit carryforward	2,866	1,185
Net operating loss carryforward	2,782	3,047
Accrued pension costs	7,494	7,662
Deferred gain on sale of real estate	873	1,105
Other	1,651	1,507
Long-Term Deferred Tax Assets, Gross	16,324	15,451
Less Valuation Allowance	(3,490)	(3,487)
Long-Term Deferred Tax Assets	12,834	11,964
Property, plant and equipment, principally due to differences in depreciation	(1,154)	(849)
Intangible assets	(110)
Long-Term Deferred Tax Liabilities	(1,264)	(849)
Net Long-Term Deferred Tax Asset	11,570	11,115
Net Deferred Tax Asset	$ 14,987	$ 15,321