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Note 9 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
   
Input Level
 
Trading investments
  $
14.9
     
1
 
Interest rate swap
  $
2.9
     
2
 
Senior notes, net of unamortized discount and debt issuance costs
  $
(599.0
)    
2