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Note J - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 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

  $ 36,130     $ 36,130       -       -  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

Carrying

Value

   

Estimated

Fair Value

 
   

(in thousands)

 
                 

Long-term debt

  $ 230,556     $ 232,732