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Note 9 - Fair Value (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

June 30, 2023

  

December 31, 2022

 
  

Carrying

  

Estimated

  

Carrying

  

Estimated

 
  

value

  

fair value

  

value

  

fair value

 

Non-qualified employee benefit plan investments

 $15  $15  $15  $15 

Investment in Venator

        5   5 

Long-term debt (including current portion)

  (1,573)  (1,437)  (1,737)  (1,578)