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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Consolidated Balance Sheets [Abstract]    
Common Stock, Par or Stated Value Per Share $ 1 $ 1
Common Stock, Shares Authorized 15,000,000 15,000,000
Common Stock, Shares, Issued 4,708,349 4,701,367
Common Stock, Shares, Outstanding 4,410,880 4,408,761
Capital Stock, Shares Authorized 5,000,000 5,000,000
Capital Stock, Shares, Issued 0 0
Capital Stock, Shares, Outstanding 0 0
Treasury Stock, Shares 297,469 292,606