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Note J - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Total
   
Level 1
   
Level 2
   
Level 3
 
   
(in thousands)
 
Marketable equity securities
  $ 27,381     $ 27,381       -       -  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Carrying
Value
   
Estimated
Fair Value
 
   
(in thousands)
 
                 
Long-term debt
  $ 151,412     $ 151,203