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Note 7 - Stockholders' Equity (Deficit) (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Stock by Class [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Original |  |  | Shares |  |  |  |  |  |  |  |  |  |  | Shares |  |  | Conversion |  |  |  | Shares |
|  | Shares |  |  | Gross |  |  | Net |  |  | Conversion |  |  | Outstanding |  |  | Series F |  |  | Series F |  |  | Outstanding |  |  | Price at |  |  |  | Issuable at |
Date of Purchase |  | Purchased |  |  | Proceeds |  |  | Proceeds |  |  | Price |  |  | December 31, 2024 |  |  | Issued |  |  | Converted |  |  | June 30, 2025 |  |  | June 30, 2025 |  |  |  | June 30, 2025 |
November 15, 2023 |  |  | 1,850 |  |  | $ | 1,850,000 |  |  | $ | 1,850,000 |  |  | $ | 124.70 |  |  |  | 150 |  |  |  | — |  |  |  | — |  |  |  | 150 |  |  | $ | 0.83 |  | (ii) |  |  | 180,854 |
March 6, 2024 |  |  | 1,000 |  |  |  | 1,000,000 |  |  |  | 950,000 |  |  |  | 60.29 |  |  |  | 435 |  |  |  | — |  |  |  | (335 | ) |  |  | 100 |  |  |  | 0.83 |  | (ii) |  |  | 120,569 |
April 12, 2024 |  |  | 1,050 |  |  |  | 1,050,000 |  |  |  | 1,050,000 |  |  |  | 37.00 |  |  |  | 1,050 |  |  |  | — |  |  |  | (1,050 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
May 31, 2024 |  |  | 1,050 |  |  |  | 1,050,000 |  |  |  | 1,025,000 |  |  |  | 32.15 |  |  |  | 1,050 |  |  |  | — |  |  |  | (525 | ) |  |  | 525 |  |  |  | 0.83 |  | (ii) |  |  | 632,988 |
July 25, 2024 |  |  | 500 |  |  |  | 500,000 |  |  |  | 500,000 |  |  |  | 23.15 |  |  |  | 500 |  |  |  | — |  |  |  | (500 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
August 27, 2024 |  |  | 500 |  |  |  | 500,000 |  |  |  | 500,000 |  |  |  | 20.19 |  |  |  | 500 |  |  |  | — |  |  |  | (500 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
October 1, 2024 (i) |  |  | 1,500 |  |  |  | — |  |  |  | — |  |  |  | 12.00 |  |  |  | 1,500 |  |  |  | — |  |  |  | (1,500 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
December 18, 2024 |  |  | 750 |  |  |  | 750,000 |  |  |  | 750,000 |  |  |  | 5.25 |  |  |  | 750 |  |  |  | — |  |  |  | (750 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
February 7, 2025 |  |  | 1,000 |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  | 2.22 |  |  |  | — |  |  |  | 1,000 |  |  |  | (1,000 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
March 17, 2025 |  |  | 500 |  |  |  | 500,000 |  |  |  | 500,000 |  |  |  | 1.20 |  |  |  | — |  |  |  | 500 |  |  |  | (500 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
May 5, 2025 |  |  | 500 |  |  |  | 500,000 |  |  |  | 500,000 |  |  |  | 0.83 |  |  |  | — |  |  |  | 500 |  |  |  | (500 | ) |  |  | — |  |  |  | 0.83 |  |  |  |  | — |
June 6, 2025 |  |  | 500 |  |  |  | 500,000 |  |  |  | 500,000 |  |  |  | 1.19 |  |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | 500 |  |  |  | 1.19 |  |  |  |  | 418,831 |
June 9, 2025 |  |  | 1,000 |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  | 1.19 |  |  |  | — |  |  |  | 1,000 |  |  |  | (600 | ) |  |  | 400 |  |  |  | 1.19 |  |  |  |  | 335,345 |
June 17, 2025 |  |  | 1,000 |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  | 1.25 |  |  |  | — |  |  |  | 1,000 |  |  |  | — |  |  |  | 1,000 |  |  |  | 1.25 |  |  |  |  | 797,067 |
Total June 30, 2025 |  |  | 12,700 |  |  | $ | 11,200,000 |  |  | $ | 11,125,000 |  |  | $ | — |  |  |  | 5,935 |  |  |  | 4,500 |  |  |  | (7,760 | ) |  |  | 2,675 |  |  | $ | — |  |  |  |  | 2,485,654 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Original |  |  | Shares |  |  |  |  |  |  |  |  |  |  | Shares |  |  | Conversion |  |  | Shares |
|  | Shares |  |  | Gross |  |  | Net |  |  | Conversion |  |  | Outstanding |  |  | Series F |  |  | Series F |  |  | Outstanding |  |  | Price at |  |  | Issuable at |
Date of Purchase |  | Purchased |  |  | Proceeds |  |  | Proceeds |  |  | Price |  |  | December 31, 2023 |  |  | Issued |  |  | Converted |  |  | June 30, 2024 |  |  | June 30, 2024 |  |  | June 30, 2024 |
June 26, 2022 |  |  | 10,000 |  |  | $ | 10,000,000 |  |  | $ | 9,920,000 |  |  | $ | 620 |  |  |  | 2,925 |  |  |  |  |  |  |  | (2,925 | ) |  |  | — |  |  | $ | 30.00 |  |  |  | — |
March 10, 2023 |  |  | 3,000 |  |  |  | 3,000,000 |  |  |  | 3,000,000 |  |  |  | 420.00 |  |  |  | 3,000 |  |  |  |  |  |  |  | (1,405 | ) |  |  | 1,595 |  |  |  | 30.00 |  |  |  | 53,167 |
November 15, 2023 |  |  | 1,850 |  |  |  | 1,850,000 |  |  |  | 1,850,000 |  |  |  | 124.70 |  |  |  | 150 |  |  |  |  |  |  |  | — |  |  |  | 150 |  |  |  | 30.00 |  |  |  | 5,000 |
March 6, 2024 |  |  | 1,000 |  |  |  | 1,000,000 |  |  |  | 950,000 |  |  |  | 60.29 |  |  |  | — |  |  |  | 1,000 |  |  |  | (550 | ) |  |  | 450 |  |  |  | 30.00 |  |  |  | 15,000 |
April 12, 2024 |  |  | 1,050 |  |  |  | 1,050,000 |  |  |  | 1,050,000 |  |  |  | 37.00 |  |  |  | — |  |  |  | 1,050 |  |  |  | — |  |  |  | 1,050 |  |  |  | 30.00 |  |  |  | 35,000 |
May 31, 2024 |  |  | 1,050 |  |  |  | 1,050,000 |  |  |  | 1,025,000 |  |  |  | 32.15 |  |  |  | — |  |  |  | 1,050 |  |  |  | — |  |  |  | 1,050 |  |  |  | 30.00 |  |  |  | 35,000 |
Total June 30, 2024 |  |  | 17,950 |  |  | $ | 17,950,000 |  |  | $ | 17,795,000 |  |  | $ | — |  |  |  | 6,075 |  |  |  | 3,100 |  |  |  | (4,880 | ) |  |  | 4,295 |  |  | $ | — |  |  |  | 143,167 |
Schedule of Dividends Payable [Table Text Block] |
Deemed Dividends on Series F Preferred Stock |
|  | Description of |  | Series F |  |  | Conversion Prices |  |  | Conversion Price |  |  | Incremental Value |
Date of Trigger Event |  | Trigger Event |  | Triggered |  |  | Prior to Trigger |  |  | After Trigger |  |  | Deemed Dividend |
March 17, 2025 |  | March 2025 Down Round Trigger |  |  | 5,025 |  |  | $ | 2.22 - 5.25 |  |  | $ | 1.20 |  |  | $ | 976,637 |
May 5, 2025 |  | May 2025 Down Round Trigger |  |  | 1,045,402 |  |  | $ | 1.10 |  |  | $ | 0.83 |  |  |  | 1,105,871 |
|  | Deemed Dividends on Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 2,082,508 |
Deemed Dividends on Series F Warrants |
March 17, 2025 |  | March 2025 Down Round Trigger |  |  | 593,247 |  |  | $ | 2.22 - 5.25 |  |  | $ | 1.20 |  |  | $ | 79,695 |
May 5, 2025 |  | May 2025 Down Round Trigger |  |  | 593,247 |  |  | $ | 1.10 |  |  | $ | 0.83 |  |  |  | 36,504 |
|  | Deemed Dividends on Series F Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 116,199 |
Deemed Dividends on Series B Warrants (see Note 8) |
May 5, 2025 |  | May 2025 Down Round Trigger |  |  | 6,777,101 |  |  | $ | 1.94 |  |  | $ | 0.83 |  |  |  | 2,426,968 |
|  | Deemed Dividends on Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 2,426,968 |
|  | Total Deemed Dividends Series F PS, Series B and F Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 4,625,675 |
Deemed Dividends on Series F Preferred Stock
| Description of | Series F | Conversion Prices | Conversion Price | Incremental Value
Date of Trigger Event | Trigger Event | Triggered | Prior to Trigger | After Trigger | Deemed Dividend
March 6, 2024 | March 2024 Down Round Trigger |  | 3,945 | $ | 60.29 - 124.50 | $ | 30.00 | $ | 5,102,674
Deemed Dividends on Series F Warrants
` | March 2024 Down Round Trigger |  | 54,695 | $ | 60.29 - 124.50 | $ | 30.00 | $ | 147,030
Total Deemed Dividends Series F PS and Series F Warrants |  |  |  |  |  |  |  | $ | 5,249,704
Warrant Modification (i) |  |  |  |  |  |  |  |  | 7,751
Total Deemed Dividends |  |  |  |  |  |  |  | $ | 5,257,455
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding as of December 31, 2024 |  |  | 7,293 |  |  | $ | 324.64 |
Granted |  |  | 142,730 |  |  |  | 1.54 |
Cancelled |  |  | (1,158 | ) |  |  | 284.01 |
Vested |  |  | (78,825 | ) |  |  | 5.07 |
Outstanding as of June 30, 2025 |  |  | 70,040 |  |  |  | 26.58 |
Vested as of June 30, 2025 |  |  | 1,243 |  |  |  | 1,363.11 |
Unvested as of June 30, 2025 |  |  | 68,797 |  |  | $ | 2.43 |
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding as of December 31, 2023 |  |  | 3,054 |  |  | $ | 901.50 |
Granted |  |  | 901 |  |  |  | 26.00 |
Cancelled |  |  | (20 | ) |  |  | 483.00 |
Vested and released |  |  | (687 | ) |  |  | 15.06 |
Outstanding as of June 30, 2024 |  |  | 3,249 |  |  |  | 709.00 |
Vested as of June 30, 2024 |  |  | 2,701 |  |  |  | 820.00 |
Unvested as of June 30, 2024 |  |  | 548 |  |  | $ | 162.00 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted Average |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |  |  | Contractual Term |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Fair Value |  |  | (Years) |  |  | Value |
Outstanding as of December 31, 2024 |  |  | 56 |  |  | $ | 5,342 |  |  | $ | 2,874 |  |  |  | 1.23 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired/Forfeited |  |  | (56 | ) |  |  | 5,342 |  |  |  | 2,874 |  |  |  | — |  |  |  | — |
Outstanding as of June 30, 2025 |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Exercisable as of June 30, 2025 |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted Average |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |  |  | Contractual Term |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Fair Value |  |  | (Years) |  |  | Value |
Outstanding as of December 31, 2023 |  |  | 2,505 |  |  | $ | 2,000 |  |  | $ | 1,080.00 |  |  |  | 1.49 |  |  | $ | 2,294 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired/Forfeited |  |  | (2,440 | ) |  |  | 1,921 |  |  |  | 1,044 |  |  |  | — |  |  |  | — |
Outstanding as of June 30, 2024 |  |  | 65 |  |  | $ | 6,038 |  |  | $ | 3,246 |  |  |  | 1.49 |  |  | $ | — |
Exercisable as of June 30, 2024 |  |  | 65 |  |  | $ | 6,038 |  |  | $ | 3,246 |  |  |  | 1.49 |  |  | $ | — |

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