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Note 6 - Deferred Compensation and Long-Term Incentive Plan (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Minimum [Member]
Note 6 - Deferred Compensation and Long-Term Incentive Plan (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period	1 year
Maximum [Member]
Note 6 - Deferred Compensation and Long-Term Incentive Plan (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period	7 years
Other Noncurrent Liabilities [Member]
Note 6 - Deferred Compensation and Long-Term Incentive Plan (Details) [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	15.0us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	$ 14.2us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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- Details

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- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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