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Note 7 - Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
  

June 30, 2024

 
  

Adjusted Cost

  

Unrealized Gains

  

Unrealized Losses

  

Fair Value

 

Level 2:

                

U.S. treasury securities

 $36,867  $4  $(2) $36,869 

Total

 $36,867  $4  $(2) $36,869 
  

December 31, 2023

 
  

Adjusted Cost

  

Unrealized Gains

  

Unrealized Losses

  

Fair Value

 

Level 2:

                

U.S. treasury securities

 $30,791  $10  $(1) $30,800 

Total

 $30,791  $10  $(1) $30,800