Note 4 - Fair Value of Financial Instruments Other Fair Value Disclosure (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,218,972,000		$ 1,209,926,000
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Invested Assets, Carrying Amount	14,000,000		14,600,000
Long-term debt	1,219,000,000		1,209,900,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets fair value disclosure	20,700,000	[1]	20,500,000	[1]
Long-term Debt, Fair Value	$ 1,862,100,000	[1]	$ 1,859,300,000	[1]

[1] These estimated fair values would be classified in Level II of the fair value hierarchy.