Note 15 - Lines of Credit and Total Debt Obligations - Carrying Amount of Senior Notes (Details) (Parentheticals) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
5.625% Senior Notes Due February 2020 [Member]
Senior Notes, interest rate	5.625%	5.625%
Senior notes, maturity date	Feb. 28, 2020	Feb. 28, 2020
Senior Notes, face amount	$ 250	$ 250
Senior Notes 5.5% Due 2024 [Member]
Senior Notes, interest rate	5.50%	5.50%
Senior notes, maturity date	Jan. 31, 2024	Jan. 31, 2024
Senior Notes, face amount	$ 250	$ 250
Senior Notes 6.00% Due January 2043 [Member]
Senior Notes, interest rate	6.00%	6.00%
Senior notes, maturity date	Jan. 31, 2043	Jan. 31, 2043
Senior Notes, face amount	$ 350	$ 350

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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