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Note D - Marketable Equity Securities (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Marketable Securities [Table Text Block]
  

June 30, 2023

  

December 31, 2022

 
  

(in thousands)

 

Fair market value

 $41,274  $41,728 

Cost

  30,349   30,350 

Unrealized gain

 $10,925  $11,378 
Unrealized Gain (Loss) on Investments [Table Text Block]
  

June 30, 2023

  

December 31, 2022

 
  

(in thousands)

 

Gross unrealized gains

 $13,480  $13,478 

Gross unrealized losses

  2,555   2,100 

Net unrealized gain

 $10,925  $11,378