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Long-Term Debt and Credit Arrangements (Notes Payable - Buildings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Jan. 23, 2015
Nov. 07, 2014
Debt Instrument [Line Items]        
Notes payable - buildings $ 12,236 $ 12,419    
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       $ 4,165
Fixed Interest Rate       4.50%
Building - Saraland [Member]        
Debt Instrument [Line Items]        
Notes payable - buildings     $ 6,290  
Debt Instrument, Interest Rate, Stated Percentage     2.00%  
Debt Instrument, Periodic Payment, Principal $ 26      
Final Payment on Debt Instument     $ 3,145  
Fixed Interest Rate     4.30%