Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares outstanding	120,376,721	119,647,149
Treasury shares (in shares)	216,523	216,523