CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013	Jun. 30, 2013
Allowance for doubtful accounts	$ 1,550	$ 1,401	$ 1,667
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	10,203,821	10,203,821	10,203,821
Treasury stock, shares	3,062,374	3,062,374	3,062,374
Class B Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000	10,000,000
Common stock, shares issued	2,757,976	2,737,076	2,737,076
Treasury stock, shares	628,114	628,114	628,114