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Note 4 - Fair Value of Financial Instruments Other Fair Value Disclosure (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,008,777 $ 1,069,537
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost Method Investments 973 1,195
Long-term debt 1,008,777 1,069,537
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost Method Investments, Fair Value Disclosure 3,751 3,789
Long-term Debt, Fair Value $ 1,104,711 $ 1,214,471