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Note 9 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member]
$ in Millions
Dec. 31, 2016
USD ($)
Fair Value, Inputs, Level 1 [Member]  
Trading investments $ 14.9
Fair Value, Inputs, Level 2 [Member]  
Interest rate swap 2.9
Senior notes, net of unamortized discount and debt issuance costs $ (599.0)