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Note 3 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements at

 
  

September 30, 2022

 
  

(unaudited)

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets

                

Money market funds

 $25,924  $25,924  $  $ 
  

Fair Value Measurements at

 
  

December 31, 2021

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets

                

Money market funds

 $49,217  $49,217  $  $ 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

March 31, 2022

  

April 1, 2022

 

Expected term (in years)

 

0.25

  

0.25

 

Expected volatility

 

112

% 

112

%

Risk-free interest rate

 

1.46

% 

1.46

%

Expected dividend yield

 

0.00

% 

0.00

%

Fair value of common share

$

1.93

 $

1.89

 

Exercise price

$

0.0001

 $

0.0001

 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

January 2022 Warrants

Balance at January 1, 2022

$

Issuance of warrants

 

10,000

Change in fair value

 

(1,228)

Balance at March 31, 2022

 

8,772

Change in fair value

 

(182)

Reclass to additional paid-in-capital upon exercise

 

(8,590)

Balance at September 30, 2022

$