v3.25.2
Note 4 - Investments and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

June 30, 2025

  

December 31, 2024

 
 

Fair Value

 

Carrying

  

Estimated

  

Carrying

  

Estimated

 
 

Hierarchy

 

Value

  

Fair Value

  

Value

  

Fair Value

 

Financial instruments not carried at fair value:

                 

Senior notes (Note 9)

Level 2

 $3,214.3  $3,133.5  $3,021.0  $2,866.5