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Note 3 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

  

Total

 

March 31, 2024

                

Financial assets:

                

Money market funds

 $17,710  $  $  $17,710 

U.S. Treasury securities

     14,876      14,876 

Total assets

 $17,710  $14,876  $  $32,586 
  

Level 1

  

Level 2

  

Level 3

  

Total

 

December 31, 2023

                

Financial assets:

                

Money market funds

 $31,403  $  $  $31,403 

U.S. Treasury securities

     4,958      4,958 

Total assets

 $31,403  $4,958  $  $36,361