Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 27, 2020	Dec. 29, 2019
Common Stock
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	10,203,821	10,203,821
Treasury stock, shares (in shares)	3,062,374	3,062,374
Class B Common Stock
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	2,860,356	2,860,356
Treasury stock, shares (in shares)	628,114	628,114