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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
   
Input Level
 
Trading investments
  $
15.4
     
1
 
Interest rate swap
  $
(3.2
)    
2
 
Senior notes, net of unamortized discount and debt issuance costs
  $
(593.1
)    
2