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Note 7 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
   
Input Level
 
Trading investments
  $
15.9
     
1
 
Interest rate swap
s
  $
(1.5
)    
2
 
Senior notes
  $
(595.3
)    
2