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Note 4 - Fair Value Measurement (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Long-term Debt $ 1,200.0us-gaap_LongTermDebt $ 842.9us-gaap_LongTermDebt
Long-term Debt, Fair Value $ 1,200.0us-gaap_LongTermDebtFairValue $ 877.5us-gaap_LongTermDebtFairValue