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Note 7 - Common Stock and Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Number of Shares

  

Exercise Price

 

Expiration Date

3,990,025  $1.88 

March 30, 2027

860,216  $2.20 

March 30, 2027

Security

 

Number of Shares

  

Exercise Price

 

Expiration Date

Pre-Funded

  2,174,149  $0.0001 

No expiration

Series A

  22,589,410  $0.7949 

April 16, 2024 (1)

Series B

  22,589,401  $0.7949 

July 16, 2025