Note 6 - Employee Benefit Plans (Details) - One-Percentage-Point Change in Assumed Health Care Cost (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
One-Percentage-Point Change in Assumed Health Care Cost [Abstract]
1% Health care cost trend rate increase	$ 15
1% Health care cost trend rate decrease	$ (13)

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (m)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration