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Note 7 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
    

2021

  

2020

 
  

Fair Value

 

Carrying

  

Estimated

  

Carrying

  

Estimated

 
  

Hierarchy

 

Value

  

Fair Value

  

Value

  

Fair Value

 

Financial instrument not carried at fair value:

                  

Senior Notes (Note 15)

 

Level 2

 $2,692.0  $3,017.4  $3,140.8  $3,652.2