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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