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Note 3 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

  

Total

 

March 31, 2026

                

Financial assets:

                

Money market funds

 $44,121  $  $  $44,121 

U.S. Treasury securities

     4,188      4,188 

Commercial paper

     8,876      8,876 

Total assets

 $44,121  $13,064  $  $57,185 
  

Level 1

  

Level 2

  

Level 3

  

Total

 

December 31, 2025

                

Financial assets:

                

Money market funds

 $46,164  $  $  $46,164 

U.S. Treasury securities

     14,060      14,060 

Total assets

 $46,164  $14,060  $  $60,224