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Note 8 - Outstanding Warrants (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Warrants, Valuation Assumptions [Table Text Block]
  

For the three months ended March 31, 2023

 

Description

 

2023

  

2022

 

Dividend-yield

  -%  -%

Risk-free interest rate

  4.41%  1.45%

Expected volatility

  125.32%  139.55%

Expected life (years)

  2.00   4.00 

Exercise price per warrant

 $0.01  $13.33 

Market value per share on grant date

 $3.96  $13.06 

Fair value per warrant on grant date

 $3.95  $11.01 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants Outstanding & Exercisable

  

Weighted - Average Exercise Price

  

Average Remaining Term in Years

 

Outstanding December 31, 2022

  355  $15.92   7.48 

Granted

  113   0.01     

Exercised

  (113)  0.01     

Outstanding March 31, 2023

  355  $15.92   7.24