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Note 4 - Investments and Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

September 30, 2023

  

December 31, 2022

 
 

Fair Value

 

Carrying

  

Estimated

  

Carrying

  

Estimated

 
 

Hierarchy

 

Value

  

Fair Value

  

Value

  

Fair Value

 

Financial instruments not carried at fair value:

                 

Senior notes (Note 10)

Level 2

 $2,833.7  $2,567.6  $2,342.6  $2,113.3