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Note F - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

  

Total at September 30, 2023

 

Equity Securities

 $22  $  $  $22 

U.S. Treasury Money Market Funds

 $40,138  $  $  $40,138 
  

Level 1

  

Level 2

  

Level 3

  

Total at December 31, 2022

 

Equity Securities

 $68  $  $  $68 

Equity Mutual Fund

 $  $16,294  $  $16,294 

Commodity Mutual Fund

 $  $222  $  $222 

U.S. Treasury Money Market Funds

 $17,722  $  $  $17,722