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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 28, 2019
Dec. 27, 2018
Accounts and notes receivable, reserves $ 272 $ 361
Preferred Stock, par (in dollars per share) $ 1 $ 1
Preferred Stock, authorized 1,000,000 1,000,000
Preferred Stock, issued 0 0
Cost of Common Stock in treasury, shares 312,557 2,839,079
Common Stock [Member]    
Common Stock, par (in dollars per share) $ 1 $ 1
Common Stock, authorized 50,000,000 50,000,000
Common Stock, issued 23,253,641 22,843,096
Class B Common Stock [Member]    
Common Stock, par (in dollars per share) $ 1 $ 1
Common Stock, authorized 33,000,000 33,000,000
Common Stock, issued 7,935,872 8,346,417
Common Stock, outstanding 7,935,872 8,346,417