Note 15 - Senior Notes (Details) - Carrying Amount of Senior Notes (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Mar. 31, 2014 5.375% Senior Notes Due December 2014 [Member]	Dec. 31, 2013 5.375% Senior Notes Due December 2014 [Member]	Sep. 30, 2014 5.375% Senior Notes Due July 2015 [Member]	Dec. 31, 2013 5.375% Senior Notes Due July 2015 [Member]	Sep. 30, 2014 Senior Notes 5.375% Due February 2020 [Member]	Dec. 31, 2013 Senior Notes 5.375% Due February 2020 [Member]	Sep. 30, 2014 5.5% Senior Notes Due 2024 [Member]	Sep. 30, 2014 6.000% Senior Notes Due January 2043 [Member]	Dec. 31, 2013 6.000% Senior Notes Due January 2043 [Member]
Note 15 - Senior Notes (Details) - Carrying Amount of Senior Notes [Line Items]
Senior notes	$ 1,096,269	$ 1,095,620	$ 249,700	$ 249,814	$ 249,967	$ 249,935	$ 246,302	$ 245,871	$ 250,000	$ 350,000	$ 350,000