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Note 8 - Outstanding Warrants (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Warrants, Valuation Assumptions [Table Text Block]
   

For the six months ended June 30,

 

Description

 

2023

   

2022

 

Dividend-yield

    - %     - %

Risk-free interest rate

    3.76 %     1.75 %

Expected volatility

    121.50 %     151.41 %

Expected life (years)

    5.43       3.47  

Exercise price per warrant

  $ 1.53     $ 10.47  

Market value per share on grant date

  $ 3.14     $ 11.29  

Fair value per warrant on grant date

  $ 2.95     $ 9.68  
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

    373       1.53          

Exercised

    (223 )     1.24          

Outstanding June 30, 2023

    505     $ 11.78       6.40