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Long-Term Debt and Credit Arrangements (Notes Payable - Buildings) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 25, 2021
Dec. 26, 2020
Nov. 07, 2014
Debt Instrument [Line Items]      
Notes payable - buildings $ 5,588 $ 5,900  
Building - Adairsville [Member]      
Debt Instrument [Line Items]      
Notes payable - buildings     $ 8,330
Debt Instrument, Interest Rate, Stated Percentage     2.00%
Debt Instrument, Periodic Payment, Principal $ 35    
Final Payment on Debt Instument     $ 4,269
Fixed Interest Rate     4.50%