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Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 15,000,000 11,000,000
Common stock, shares issued 7,299,009 7,299,009
Common stock, shares outstanding 7,212,919 7,212,919
Treasury stock, shares 86,090 86,090