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Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures (Parentheticals)
Dec. 31, 2014
3.84% Senior Notes [Member]  
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures (Parentheticals) [Line Items]  
Interest rate 3.84%
6.40% Senior Notes [Member]  
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures (Parentheticals) [Line Items]  
Interest rate 6.40%
5.44% Senior Notes [Member]  
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures (Parentheticals) [Line Items]  
Interest rate 5.44%