Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Items [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 28, 2013		14,624,159			3,524,742
Beginning balance at Dec. 28, 2013	$ 270,421	$ 146	$ 96,809	$ 248,170	$ (76,339)	$ 710	$ 925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,169			12,911			258
Dividends declared	(3,315)			(3,315)
Activity under stock plans (in shares)					(134,416)
Activity under stock plans	1,410		(1,514)		$ 2,924
Tax benefits related to employees' and directors' stock plans	703		703
Purchases of Company common stock (in shares)					305,135
Purchases of Company common stock	(11,250)				$ (11,250)
Other comprehensive items	(75)					(68)	(7)
Ending balance (in shares) at Jun. 28, 2014		14,624,159			3,695,461
Ending balance at Jun. 28, 2014	271,063	$ 146	95,998	257,766	$ (84,665)	642	1,176
Beginning balance (in shares) at Jan. 03, 2015		14,624,159			3,760,019
Beginning balance at Jan. 03, 2015	265,459	$ 146	98,769	270,249	$ (87,727)	(17,146)	1,168
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,526			15,361			165
Dividends declared	(3,716)			(3,716)
Activity under stock plans (in shares)					(115,427)
Activity under stock plans	1,192		(1,505)		$ 2,697
Tax benefits related to employees' and directors' stock plans	884		884
Purchases of Company common stock (in shares)					86,518
Purchases of Company common stock	(4,040)				$ (4,040)
Other comprehensive items	(9,630)					(9,524)	(106)
Ending balance (in shares) at Jul. 04, 2015		14,624,159			3,731,110
Ending balance at Jul. 04, 2015	$ 265,675	$ 146	$ 98,148	$ 281,894	$ (89,070)	$ (26,670)	$ 1,227