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Note 3 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

  

Total

 

September 30, 2025

                

Financial assets:

                

Money market funds

 $5,727  $  $  $5,727 

U.S. Treasury securities

     16,892      16,892 

Commercial paper

     2,653      2,653 

Total assets

 $5,727  $19,545  $  $25,272 
  

Level 1

  

Level 2

  

Level 3

  

Total

 

December 31, 2024

                

Financial assets:

                

Money market funds

 $16,489  $  $  $16,489 

U.S. Treasury securities

     23,805      23,805 

Commercial paper

     2,689      2,689 

Total assets

 $16,489  $26,494  $  $42,983