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Note 5 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2022
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, 2022:

            

Cash equivalents:

            

Money market funds

 $3,886,704  $  $ 

Commercial paper

     994,427    

Total cash equivalents

 $3,886,704  $994,427  $ 
             

Marketable securities

            

Commercial paper

 $  

$

17,601,081  $ 

US treasury

     4,973,600    

Total marketable securities

 $  $22,574,681  $ 
             

Total financial assets

 $3,886,704  $23,569,108  $