Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Stockholders' Equity, Total [Member]	Comprehensive Income [Member]
Balance at Jan. 03, 2009		$ 22	$ (366)	$ 173,997	$ 15,377	$ 590	$ 189,620	$ (37,883)
Balance, shares at Jan. 03, 2009		22,115,377
Stockholders' Equity
Net Income	12,376				12,376		12,376	12,376
Foreign currency translation adjustment, net of tax						(1,096)	(1,096)	(1,096)
Common stock issued under equity compensation plan, shares		88,393
Common stock issued under equity compensation plan, value				2,704			2,704
Tax benefit (deficiency) from equity issuance, including excess tax benefit	(46)			46			46
Treasury stock acquired, shares		(3,318)
Treasury stock acquired, value	(19)		(19)				(19)
Sale of common stock pursuant to associates stock buying plan, shares		145,531
Sale of common stock pursuant to associates stock buying plan, value				712			712
Balance at Jan. 02, 2010		22	(385)	177,459	27,754	(506)	204,344	11,280
Balance, shares at Jan. 02, 2010		22,345,983
Stockholders' Equity
Net Income	13,227				13,227		13,227	13,227
Foreign currency translation adjustment, net of tax						(243)	(243)	(243)
Common stock issued under equity compensation plan, shares		195,758
Common stock issued under equity compensation plan, value		1		3,522			3,523
Tax benefit (deficiency) from equity issuance, including excess tax benefit	(292)			292			292
Treasury stock acquired, value	0
Sale of common stock pursuant to associates stock buying plan, shares		83,452
Sale of common stock pursuant to associates stock buying plan, value				618			618
Balance at Jan. 01, 2011	221,761	23	(385)	181,891	40,981	(749)	221,761	12,984
Balance, shares at Jan. 01, 2011	22,625,193	22,625,193
Stockholders' Equity
Net Income	29,662				29,662		29,662	29,662
Foreign currency translation adjustment, net of tax						22	22	22
Common stock issued under equity compensation plan, shares		282,813
Common stock issued under equity compensation plan, value				3,733			3,733
Tax benefit (deficiency) from equity issuance, including excess tax benefit	204			(204)			(204)
Treasury stock acquired, value	0
Sale of common stock pursuant to associates stock buying plan, shares		83,758
Sale of common stock pursuant to associates stock buying plan, value				669			669
Balance at Dec. 31, 2011	$ 255,643	$ 23	$ (385)	$ 186,089	$ 70,643	$ (727)	$ 255,643	$ 29,684
Balance, shares at Dec. 31, 2011	22,991,764	22,991,764