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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Consolidated Balance Sheets [Abstract]    
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 10,000,000 10,000,000
Common Stock, Shares, Issued 6,257,563 6,256,063
Treasury Stock, Shares 5,729 2,608