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Note 3 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value at March 31, 2023

 
   

Total

   

Level 1

   

Level 2

   

Level 3

 
Liabilities:                                

Derivative liability - Warrants

    406       -       -       406  

Total liabilities

  $ 406     $ -     $ -     $ 406  
   

Fair Value at December 31, 2022

 
   

Total

   

Level 1

   

Level 2

   

Level 3

 
Liabilities:                                

Derivative liability - Warrants

    629       -       -       629  

Total liabilities

  $ 629     $ -     $ -     $ 629  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Derivative liability - Warrants

 

Balance at January 1, 2023

  $ 629  

Change in fair value

    (223 )

Balance at March 31, 2023

  $ 406  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
   

March 31,

   

December 31,

 
   

2023

   

2022

 

Exercise price

  $ 0.4431     $ 0.4431  

Contractual term (years)

    1.07       1.32  

Volatility (annual)

    105.0 %     100.0 %

Risk-free rate

    4.6 %     4.6 %

Dividend yield (per share)

    0 %     0 %