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Note 7 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Asset/(Liability)

Balance

     
  

June 30, 2022

  

December 31, 2021

  

Input Level

 

Trading investments

 $24.3  $26.0   1 

Interest rate swap

 $-  $6.3   2 

Senior notes, net of unamortized discount and debt issuance costs

 $-  $(356.0)  2