Significant Accounting Policies (Tables)

12 Months Ended

Dec. 29, 2012

Significant Accounting Policies [Abstract]

Allowance For Doubtful Accounts

	YEARS ENDED
(THOUSANDS OF DOLLARS)	DECEMBER 29, 2012		DECEMBER 31, 2011		JANUARY 1, 2011
Allowance for Doubtful Accounts - Beginning of Year	$	1,020	$	1,069	$	1,129
(Credited) charged to bad debt expense		(206)		68		139
Deductions		(181)		(117)		(199)
Allowance for Doubtful Accounts - End of Year	$	633	$	1,020	$	1,069

Schedule Of Estimated Useful Life Of Property Plant And Equipment

Leasehold Improvements	3 to 15	years
Machinery & Equipment	2 to 10	years
Furniture & Fixtures	2 to 10	years
Vehicles, Tooling and Desktop PCs	2 to   5	years

Components Of Property, Plant And Equipment

		YEARS ENDED
(THOUSANDS OF DOLLARS)	DECEMBER 29, 2012		DECEMBER 31, 2011
Leasehold improvements	$	2,106	$	2,060
Machinery and equipment		110,795		105,873
		112,901		107,933
Less accumulated depreciation		98,525		94,227
Property, Plant and Equipment, Net	$	14,376	$	13,706

Schedule Of Activity Reflects In Aggregate Accrued Warranty Costs

	YEARS ENDED
(THOUSANDS OF DOLLARS)	DECEMBER 29, 2012		DECEMBER 31, 2011		JANUARY 1, 2011
Accrued Warranty Costs - Beginning of Year	$	1,892	$	1,998	$	1,936
Warranty costs paid		(274)		(391)		(735)
Warranty costs accrued		376		423		423
Impact of changes in estimates and assumptions		(282)		(138)		374
Accrued Warranty Costs - End of Year	$	1,712	$	1,892	$	1,998