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Note 6 - Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number of

  

Exercise

  

Remaining

 
  

Shares

  

Price

  

Contractual Life (years)

 

Outstanding warrants expiring January 9, 2023

  12,833  $75.00   0.33 

Outstanding warrants expiring January 28, 2025

  431,250  $10.00   2.33 

Outstanding warrants expiring May 7, 2026

  958,334  $20.00   3.60 

Outstanding warrants on September 30, 2022

  1,402,417  $17.43   3.18