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Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
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 4,384,958 3,261,148
Treasury stock, shares 206,114 206,114