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Note 9 - Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
          
   
December 31,
          
   
2018
    
2017
    
Input Level
  
Trading investments
   $
15.7
     $
16.4
      
1
  
Interest rate swaps
   $
(4.8
 )   $
(1.4
 )    
2
  
Senior notes, net of unamortized discount and debt issuance costs
   $
(591.3
 )   $
(595.6
 )    
2