Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 30, 2018
Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	10,203,821	10,203,821
Treasury stock, shares	3,062,374	3,062,374
Class B Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	2,860,356	2,841,132
Treasury stock, shares	628,114	628,114