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Note 6 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset

Balance

         
   

March 31, 2024

   

December 31, 2023

   

Input Level

 

Trading investments

  $ 32.5     $ 31.6       1