Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 28, 2013	Dec. 29, 2012
Class A [Member]
Shareholders' Equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,626,000	19,177,000
Common stock, shares outstanding	11,386,000	11,163,000
Class B [Member]
Shareholders' Equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	1,805,000	1,805,000
Common stock, shares outstanding	1,805,000	1,805,000