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Note 4 - Capital Stock (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Common Stock, Shares Authorized (in shares) | 150,000,000 | 150,000,000 |  | 150,000,000 | 150,000,000
Common Stock, Shares, Issued (in shares) | 28,249,971 | 28,249,971 |  | 16,692,124 | 28,249,971
Common Stock, Shares, Outstanding (in shares) | 28,242,418 | 28,242,418 |  | 16,684,571 | 28,242,418
Dividends, Preferred Stock |  | $ 64,000 | $ 149,000 |  |
Common Stock [Member] |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) | 28,242,000 | 28,242,000 |  |  | 28,242,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.71 | $ 1.71 |  |  | $ 1.71
Conversion of Series F Preferred Stock to Common Stock [Member] |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 2,111 | 3,033 |  |  |
Dividends, Preferred Stock | $ 110,000 | $ 194,000 |  |  |
Conversion of Stock, Shares Issued (in shares) | 7,955,743 | 11,558,000 |  | 14,102,000 | 25,660,000

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