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Note 5 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 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)

 

March 31, 2022:

            

Cash equivalents:

            

Money market funds

 $5,046,607  $  $ 

Commercial paper

     3,499,545    

Total cash and cash equivalents

 $5,046,607  $3,499,545  $ 
             

Marketable securities:

            

Commercial paper

     19,676,153    

US treasury

     3,004,150    

Total marketable securities

 $  $22,680,303  $ 
             

Total financial assets

 $5,046,607  $26,179,848  $