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Note 3 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Note 3 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value of Derivatives	$ (22,720)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet	[1]	$ 1,412us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Fair Value, Inputs, Level 1 [Member]
Note 3 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value of Derivatives	0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	[1]	0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Note 3 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value of Derivatives	(22,720)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	[1]	1,412us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Note 3 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value of Derivatives	$ 0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	[1]	$ 0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
[1] Excludes cash collateral of $5.0 million provided by the Company to the counterparty.

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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