Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Marketable Securities (Tables)

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Note 4 - Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Fair Value, Marketable Securities Measured on a Recurring Basis [Table Text Block]
   

Fair Value Measurements Using Inputs Considered as of:

 
    March 31, 2024    

December 31, 2023

 
   

Total

   

Level 1

   

Level 2

   

Level 3

   

Total

   

Level 1

   

Level 2

   

Level 3

 

Commercial paper and corporate bonds

  $ 22,781     $     $ 22,781     $     $ 21,764     $     $ 21,764     $  

Government securities

    21,638             21,638             26,588             26,588        

Total

  $ 44,419     $     $ 44,419     $     $ 48,352     $     $ 48,352     $