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Note D - Marketable Equity Securities (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Marketable Securities [Table Text Block]
  

March 31, 2021

  

December 31, 2020

 
  

(in thousands)

 

Fair market value

 $31,913  $27,941 

Cost

  26,147   25,860 

Unrealized gain

 $5,766  $2,081 
Unrealized Gain (Loss) on Investments [Table Text Block]
  

March 31, 2021

  

December 31, 2020

 
  

(in thousands)

 

Gross unrealized gains

 $9,334  $7,048 

Gross unrealized losses

  3,568   4,967 

Net unrealized gain

 $5,766  $2,081 
Schedule of Realized Gain (Loss) [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2021

  

2020

 
  

(in thousands)

 

Sales proceeds

 $663  $677 

Cost of securities sold

  123   1,211 

Realized gain / (loss)

 $540  $(534)