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CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
Sep. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, authorized (in shares) 4,000,000 4,000,000
Common stock, outstanding (in shares) 2,339,139 2,339,139