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(Unaudited) Condensed Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 8,000,000 8,000,000
Common stock, shares issued 5,244,838 5,044,838
Common stock, shares outstanding 5,051,390 4,847,390
Treasury stock, shares 193,448 197,448