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Long-Term Debt and Credit Arrangements (Notes Payable - Buildings) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 27, 2020
Dec. 28, 2019
Nov. 07, 2014
Debt Instrument [Line Items]      
Notes payable - buildings $ 6,074 $ 6,213  
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%