Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes (Parentheticals)	Sep. 30, 2015	Dec. 31, 2014
5.625% Senior Notes Due 2020 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes (Parentheticals) [Line Items]
Senior notes, interest rate	5.625%	5.625%
5.5% Senior Notes Due 2024 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes (Parentheticals) [Line Items]
Senior notes, interest rate	5.50%	5.50%
6.000% Senior Notes Due January 2043 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes (Parentheticals) [Line Items]
Senior notes, interest rate	6.00%	6.00%