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Note 5 - Warrants to Purchase Common Stock (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of Shares

   

Weighted Average Exercise Price

   

Weighted Average Remaining Life (in

years)

 

Warrants as of December 31, 2022

    109,584     $ 13.24       4.53  

Issued

    -     $ -       -  

Exercised

    -     $ -       -  

Warrants as of September 30, 2023

    109,584     $ 13.25       3.78