Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Class A [Member] Common Stock [Member]	Class B [Member] Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Beginning Balances at Jan. 02, 2010	$ 17,660	$ 1,805	$ 23,574	$ 77,000	$ (10,998)	$ (35,332)	$ 73,709
Beginning Balances, shares at Jan. 02, 2010						5,806,000
Purchase of treasury stock, value						(267)	(267)
Purchase of treasury stock, shares						43,000
Purchase of treasury stock from related party, value						(5,612)	(5,612)
Purchase of treasury stock from related party, shares						1,371,000
Grant of restricted stock for future services, value	725		(725)
Cancellation of restricted stock, value			1,037			(1,037)
Cancellation of restricted stock, shares						104,000
Stock option activity, net of settlements, value	18		(94)				(76)
Tax provision on stock-based awards			70				70
Stock purchase plan, value	4		15				19
Non-cash stock-based directors' fees, value	32		121				153
Amortization of stock-based compensation			1,077				1,077
Stock option expense			939				939
Foreign currency translation adjustments					(302)		(302)
Pension liability adjustment, net					(1,591)		(1,591)
Unrealized gain on interest rate swap					232		232
Net Income				6,208			6,208
Ending Balances at Jan. 01, 2011	18,439	1,805	26,014	83,208	(12,659)	(42,248)	74,559
Ending Balances, shares at Jan. 01, 2011						7,324,000
Purchase of treasury stock, value						(1,619)	(1,619)
Purchase of treasury stock, shares						158,000
Grant of restricted stock for future services, value	154		(154)
Cancellation of restricted stock, value			976			(976)
Cancellation of restricted stock, shares						98,000
Stock option activity, net of settlements, value	98		(375)				(277)
Tax provision on stock-based awards			830				830
Stock purchase plan, value	1		16				17
Non-cash stock-based directors' fees, value	13		137				150
Stock awards, value	8		75				83
Amortization of stock-based compensation			1,330				1,330
Stock option expense			329				329
Foreign currency translation adjustments					(143)		(143)
Pension liability adjustment, net					(5,925)		(5,925)
Unrealized gain on interest rate swap					9		9
Net Income				8,310			8,310
Ending Balances at Dec. 31, 2011	18,713	1,805	29,178	91,518	(18,718)	(44,843)	77,653
Ending Balances, shares at Dec. 31, 2011						7,580,000
Purchase of treasury stock, value						(4,022)	(4,022)
Purchase of treasury stock, shares						400,000
Grant of restricted stock for future services, value	344		(344)
Cancellation of restricted stock, value			162			(162)
Cancellation of restricted stock, shares						34,000
Stock option activity, net of settlements, value	100		221				321
Stock option activity, net of settlements, shares							167,501
Tax provision on stock-based awards			653				653
Stock purchase plan, value	2		21				23
Non-cash stock-based directors' fees, value	18		162				180
Amortization of stock-based compensation			2,138				2,138
Stock option expense			118				118
Pension liability adjustment, net					(1,187)		(1,187)
Unrealized gain on interest rate swap					53		53
Net Income				9,148			9,148
Ending Balances at Dec. 29, 2012	$ 19,177	$ 1,805	$ 32,309	$ 100,666	$ (19,852)	$ (49,027)	$ 85,078
Ending Balances, shares at Dec. 29, 2012						8,014,000