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Note 6 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset

Balance

         
   

June 30, 2023

   

December 31, 2022

   

Input Level

 

Trading investments

  $ 30.0     $ 25.1       1