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Note 3 - Investments and Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
    

December 31, 2022

 

Assets

 

Classification

 

Level 1

  

Level 2

  

Level 3

  

Total

 

Money market funds

 

Cash and cash equivalents

 $57,973  $  $  $57,973 

Total assets measured at fair value

   $57,973  $  $  $57,973 
    

December 31, 2021

 

Assets

 

Classification

 

Level 1

  

Level 2

  

Level 3

  

Total

 

Money market funds

 

Cash and cash equivalents

 $23,675  $  $  $23,675 

Total assets measured at fair value

   $23,675  $  $  $23,675