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Note 3 - Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2026
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Fair Value Measurements as of June 30, 2026:  
   

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

    

Significant Other
Observable
Inputs
(Level 2)

    

Significant
Unobservable
Inputs
(Level 3)

    

Fair Value

  

Assets

                                

Corporate bonds

   $ —     $ 111,644     $ —     $ 111,644  

Commercial paper

     16,824       —       —       16,824  

Certificates of deposit

     —       10,164       —       10,164  

U.S. government treasuries

     1,698       —       —       1,698  

Asset-backed securities

     —       4,096       —       4,096  

Money market funds (cash equivalents)

     —       —       —       —  

Total assets

   $ 18,522     $ 125,904     $ —     $ 144,426  
   

Fair Value Measurements as of December 31, 2025:

  
   

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

    

Significant Other
Observable
Inputs
(Level 2)

    

Significant
Unobservable
Inputs
(Level 3)

    

Fair Value

  

Assets

                                

Corporate bonds

   $ —     $ 86,636     $ —     $ 86,636  

Commercial paper

     68,977       —       —       68,977  

Certificates of deposit

     —       14,960       —       14,960  

U.S. government treasuries

     1,664       —       —       1,664  

Asset-backed securities

     —       6,026       —       6,026  

Money market funds (cash equivalents)

     8,383       —       —       8,383  

Total assets

   $ 79,024     $ 107,622     $ —     $ 186,646