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Note 7 - Fair Value Measurements (Details Textual) - Senior Notes [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Long-term Debt, Total $ 1,307.0 $ 1,295.7
Fair Value, Recurring [Member]    
Long-term Debt, Total 943,100.0  
Long-term Debt, Fair Value $ 1,080.0