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Note J - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Total
   
Level 1
   
Level 2
   
Level 3
 
   
(in thousands)
 
                                 
Marketable equity securities
  $
26,104
    $
26,104
     
-
     
-
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Carrying
Value
   
Estimated
Fair Value
 
   
(in thousands)
 
                 
Long-term debt
  $
164,912
    $
163,017