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Note 8 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

         
   

December 31,

         
   

2023

   

2022

   

Input Level

 

Trading investments

  $ 31.6     $ 25.1       1