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Note 3 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
      

Active Markets

  

Significant Other

  

Significant

     
      

for Identical

Assets

  

Observable

Inputs

  

Unobservable

Inputs

     
  

December 31, 2023

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Amortized Cost

 

Cash equivalents:

                    

Money Market Funds

 $55,485  $55,485  $-  $-  $55,485 
      

Active Markets

  

Significant Other

  

Significant

     
      

for Identical

Assets

  

Observable

Inputs

  

Unobservable

Inputs

     
  

December 31, 2022

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Amortized Cost

 

Cash equivalents:

                    

Money Market Funds

 $67,801  $67,801  $-  $-  $67,801