Consolidated Condensed Balance Sheets (Parenthetical) (USD $)	Jun. 26, 2011	Dec. 26, 2010
Cumulative Convertible [Member]
Preferred stock, par value	$ 5	$ 5
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	22,596,066	22,493,878
Class B Common Stock [Member]
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	600,000	600,000
Common stock, shares issued	548,564	548,564