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Note 3 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements at

 
  

March 31, 2022

 
  

(unaudited)

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets

                

Money market funds

 $49,223  $49,223  $  $ 

Liabilities

                

Warrant liability

 $8,772  $  $  $8,772 
  

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]

Parameter

 

January 2022 Warrants

 

Expected term (in years)

  0.25 

Expected volatility

  112%

Risk-free interest rate

  1.46%

Expected dividend yield

  0.00%

Fair value of common share

 $1.93 

Exercise price

 $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