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Note 8 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

         
   

December 31,

         
   

2022

   

2021

   

Input Level

 

Trading investments

  $ 25.1     $ 26.0       1  

Interest rate swap

  $ -     $ 6.3       2  

Senior notes, net of unamortized discount and debt issuance costs

  $ -     $ (356.0 )     2