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Note 7 - Common Stock and Common Stock Warrants (Tables)
6 Months Ended
Jun. 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

15,870,199

$

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