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Note 4 - Capital Stock - Summary of Warrants Activity (Details) - $ / shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Warrants outstanding (in shares) | 5,101,345 | 5,101,345 |
Warrants outstanding as of December 31, 2023 (in shares) | 5,101,345 | 5,101,345 |
Warrants Issued on June 28, 2021 [Member] |  |  |
Warrants outstanding (in shares) | 750 | 750 |
Exercise Price (in dollars per share) | $ 66 | $ 66 |
Warrants outstanding as of December 31, 2023 (in shares) | 750 | 750 |
Warrants outstanding as of December 31, 2023 (in dollars per share) | $ 66 | $ 66 |
Warrants Issued on March 31, 2023 [Member] |  |  |
Warrants outstanding (in shares) | 4,136,850 | 4,136,850 |
Exercise Price (in dollars per share) | $ 1.71 | $ 1.71 |
Warrants outstanding as of December 31, 2023 (in shares) | 4,136,850 | 4,136,850 |
Warrants outstanding as of December 31, 2023 (in dollars per share) | $ 1.71 | $ 1.71 |
Common Warrants [Member] |  |  |
Warrants outstanding (in shares) | 5,101,345 | 5,101,345 | 4,137,850
Exercise Price (in dollars per share) | $ 1.71 | $ 1.71 | $ 1.73
Warrants outstanding as of December 31, 2022 (in shares) |  | 4,137,850 | 343,099
Warrants outstanding as of December 31, 2022 (in dollars per share) |  | $ 1.73 | $ 0
Granted, warrants (in shares) | 963,745 | 963,745 | 4,543,626
Granted, warrants, exercise price (in dollars per share) |  | $ 1.71 | $ 1.56
Exercised, warrants (in shares) |  |  | (746,027)
Exercised, warrants, exercise price (in dollars per share) |  |  | $ 0.78
Expired, warrants (in shares) |  | (250) | (2,848)
Expired, warrants, exercise price (in dollars per share) |  | $ 60 | $ 70.25
Warrants outstanding as of December 31, 2023 (in shares) | 5,101,345 | 5,101,345 | 4,137,850
Warrants outstanding as of December 31, 2023 (in dollars per share) | $ 1.71 | $ 1.71 | $ 1.73
Warrants Issued in Q2 2024 [Member] |  |  |
Warrants outstanding (in shares) | 963,745 | 963,745 |
Exercise Price (in dollars per share) | $ 1.71 | $ 1.71 |
Warrants outstanding as of December 31, 2023 (in shares) | 963,745 | 963,745 |
Warrants outstanding as of December 31, 2023 (in dollars per share) | $ 1.71 | $ 1.71 |

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