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Note 3 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
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 at December 31, 2020

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

                

Derivative liability - Warrants

  4,444   -   -   4,444 

Total liabilities

 $4,444  $-  $-  $4,444
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Derivative liability - Warrants

 

Balance at January 1, 2020

 $4,144 

Change in fair value

  300 

Balance at December 31, 2020

  4,444 

Change in fair value

  (3,545)

Balance at December 31, 2021

 $899 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

For the years ended

 
  

December 31,

 
  

2021

  

2020

 

Exercise price

 $0.4431  $0.4431 

Contractual term (years)

  6.00   6.00 

Volatility (annual)

  85.0%  75.0%

Risk-free rate

  0.9%  0.5%

Dividend yield (per share)

  0%  0%