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Note 5 - Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Marketable Securities [Table Text Block]
   

Fair Value Measurements as of December 31, 2024 Using:

 
   

Amortized Cost

   

Unrealized gains

   

Unrealized Losses

   

Fair Value

 

Assets

                               

Corporate bonds

  $ 44,794     $ 175     $ (6 )   $ 44,963  

Certificates of deposit

    15,262       8       (1 )     15,269  

Commercial paper

    12,081       5       (2 )     12,084  

Asset-backed securities

    6,484       40             6,524  

U.S. government treasuries

    4,408       2       (11 )     4,399  

Total assets

  $ 83,029     $ 230     $ (20 )   $ 83,239  
                                 
                                 
   

Fair Value Measurements as of December 31, 2023 Using:

 
   

Amortized Cost

   

Unrealized gains

   

Unrealized Losses

   

Fair Value

 

Assets

                               

Corporate bonds

  $ 54,256     $ 74     $ (49 )   $ 54,281  

Certificates of deposit

    18,850       17       (1 )     18,866  

Commercial paper

    28,507       30       (3 )     28,534  

Asset-backed securities

    10,456       23       (7 )     10,472  

U.S. government treasuries

    16,127       3       (50 )     16,080  

Total assets

  $ 128,196     $ 147     $ (110 )   $ 128,233  
Investments Classified by Contractual Maturity Date [Table Text Block]
   

As of December 31,

 
   

2024

   

2023

 

Maturing in one year or less

    56,386       93,117  

Maturing after one year through two years

    26,853       35,116  

Total

  $ 83,239     $ 128,233