Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Income Taxes [Abstract]
Additional costs inventoried for tax purposes and inventory adjustments not deductible for tax purposes	$ 1,077	$ 2,592
Excess benefit plan	1,005	889
Accrued pension costs	689	668
Net operating loss carryforward	1,315
Other	1,548	1,466
Current Deferred Tax Assets, Gross	5,634	5,615
Less Valuation Allowance	(1,428)	(1,159)
Current Deferred Tax Assets	4,206	4,456
Intangible assets	212	682
Accrued warranty costs	733	773
Foreign tax credit carryforward	1,185	1,682
Net operating loss carryforward	3,047	2,665
Accrued pension costs	7,662	6,427
Deferred gain on sale of real estate	1,105	1,329
Other	1,507	1,584
Long-Term Deferred Tax Assets, Gross	15,451	15,142
Less Valuation Allowance	(3,487)	(3,624)
Long-Term Deferred Tax Assets	11,964	11,518
Property, plant and equipment, principally due to differences in depreciation	(849)	(200)
Long-Term Deferred Tax Liabilities	(849)	(200)
Net Long-Term Deferred Tax Asset	11,115	11,318
Net Deferred Tax Asset	$ 15,321	$ 15,774