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Note 4 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value Measurements as of December 31, 2024 (000's):

 
   

Quoted Prices

   

Significant

                 
   

in Active

   

Other

   

Significant

         
   

Markets for

   

Observable

   

Unobservable

         
   

Identical Assets

   

Inputs

   

Inputs

         
   

(Level 1)

   

(Level 2)

   

(Level 3)

   

Fair Value

 

Assets

                               

Corporate bonds

  $     $ 44,963     $     $ 44,963  

Certificates of deposit

          15,269             15,269  

Commercial paper

    12,084                   12,084  

U.S. government treasuries

    4,399                   4,399  

Asset-backed securities

          6,524             6,524  

Money market funds (cash equivalents)

    23,880                   23,880  

Total assets

  $ 40,363     $ 66,756     $     $ 107,119  
                                 
   

Fair Value Measurements as of December 31, 2023 (000's):

 
   

Quoted Prices

   

Significant

                 
   

in Active

   

Other

   

Significant

         
   

Markets for

   

Observable

   

Unobservable

         
   

Identical Assets

   

Inputs

   

Inputs

         
   

(Level 1)

   

(Level 2)

   

(Level 3)

   

Fair Value

 

Assets

                               

Corporate bonds

  $     $ 54,281     $     $ 54,281  
Certificates of deposit      —       18,866        —       18,866  

Commercial paper

    28,534                   28,534  

U.S. government treasuries

    16,080                     16,080  

Asset-backed securities

          10,472             10,472  

Money market funds (cash equivalents)

    575                   575  

Total assets

  $ 45,189     $ 83,619     $     $ 128,808