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Note 3 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value at December 31, 2021

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

                

Derivative liability - Warrants

  899   -   -   899 

Total liabilities

 $899  $-  $-  $899 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Derivative liability - Warrants

 

Balance at January 1, 2022

 $899 

Change in fair value

  (352)

Balance at June 30, 2022

 $547 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

June 30,

  

December 31,

 
  

2022

  

2021

 

Exercise price

 $0.4431  $0.4431 

Contractual term (years)

  1.82   2.32 

Volatility (annual)

  100.0%  90.0%

Risk-free rate

  2.9%  0.8%

Dividend yield (per share)

  0%  0%