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Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 11,000,000 8,000,000
Common stock, shares issued 5,662,645 5,662,645
Common stock, shares outstanding 5,568,962 5,476,197
Treasury stock, shares 93,683 186,448