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Note 4 - Capital Stock - Summary of Common Stock Outstanding (Details) - shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Less Treasury Shares: (in shares) | (7,553) |  |  |  | (7,553) | (7,553)
Common stock, outstanding (in shares) | 28,242,418 |  |  |  | 28,242,418 | 16,684,571
Common Stock [Member] |  |  |  |  |  |
Issued Shares (in shares) |  | 16,692,000 |  | 2,071,000 | 16,692,000 | 2,071,000
Issuances from Preferred Stock conversions (in shares) | 7,956,000 | 3,602,000 | 147,000 |  | 11,558,000 | 14,102,000
Issuances related to warrant exercises (in shares) | 0 |  | 339,000 |  |  | 746,000
Issuances related to stock compensation (in shares) | 0 | 0 | 180,000 | 0 |  | 180,000
Common shares exchanged for prepaid warrants (in shares) |  |  |  |  |  | (407,000)
Issued Shares (in shares) | 28,250,000 |  |  |  | 28,250,000 | 16,692,000
Less Treasury Shares: (in shares) | (8,000) |  |  |  | (8,000) |
Common stock, outstanding (in shares) | 28,242,000 |  |  |  | 28,242,000 |

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