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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jul. 01, 2021
Dec. 31, 2020
Accounts receivable, reserves $ 1,151 $ 1,284
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 59,476 124,758
Common Stock [Member]    
Common Stock, par (in dollars per share) $ 1 $ 1
Common Stock, authorized 50,000,000 50,000,000
Common Stock, issued 24,342,040 23,264,259
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 7,130,125 7,925,254
Common Stock, outstanding 7,130,125 7,925,254