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Note J - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Total

  

Level 1

  

Level 2

  

Level 3

 
  

(in thousands)

 

Marketable equity securities

 $31,913  $31,913   -   - 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

Carrying

Value

  

Estimated

Fair Value

 
  

(in thousands)

 
         

Long-term debt

 $265,822  $267,744