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Note 5 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Oct. 06, 2023 | Mar. 30, 2023
Accrued Dividends amount |  |  | $ 64,000 | $ 149,000 |  |  |  |
Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  | $ 0.2792 |
Preferred stock, shares outstanding (in shares) |  | 545 | 545 |  | 1,930 | 545 |  |
Conversion of Series F Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |
Accrued Dividends amount |  | $ 110,000 | $ 194,000 |  |  |  |  |
Conversions, preferred (in shares) |  | (2,111) | (3,033) |  |  |  |  |
Conversions, Shares Issued (in shares) |  | 7,955,743 | 11,558,000 |  | 14,102,000 | 25,660,000 |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |
Issuance, preferred (in shares) | 6,550 |  | 1,648 |  |  |  |  |
Accrued Dividends amount |  |  | $ 63,000,000 |  | $ 345,000,000 |  |  |
Conversions, preferred (in shares) |  |  | (3,033) |  | (4,620) |  |  |
Conversions dividend |  |  | $ (195,000,000) |  | $ (209,000,000) |  |  |
Convertible, Conversion Price (in dollars per share) |  | $ 0.33 | $ 0.33 | $ 1.71 |  | $ 0.33 |  | $ 1.71
Preferred stock, shares outstanding (in shares) |  | 545 | 545 |  | 1,930 | 545 |  |
Balance dividend |  | $ 4,000,000 | $ 4,000,000 |  | $ 136,000,000 | $ 4,000,000 |  |
Series F Preferred Stock [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |
Convertible, Conversion Price (in dollars per share) |  | $ 0.28 | $ 0.28 |  | $ 0.34 | $ 0.28 |  |

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