Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$ 2.00	$ 2.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	23,354,082	22,878,654
Common stock, shares outstanding	23,354,082	22,878,654