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Note 5 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   

Fair value measurement at reporting date

 
   

Quoted prices in

active markets for

identical assets

(Level 1)

   

Significant other

observable inputs

(Level 2)

   

Significant

unobservable inputs

(Level 3)

 
June 30, 2023                        
Cash equivalents:                        

Money market funds

  $ 13,683,496     $     $  

Total cash equivalents

  $ 13,683,496     $     $  
                         
December 31, 2022:                        

Cash equivalents:

                       

Money market funds

  $ 8,526,786     $     $  

Commercial paper

                 

Total cash equivalents

  $ 8,526,786     $     $  
                         
Marketable securities:                        
Commercial paper   $     $ 9,424,170     $  

US treasury

          2,984,770        

Total marketable securities

  $     $ 12,408,940     $  
                         

Total financial assets

  $ 8,526,786     $ 12,408,940     $