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Note 3 - Summary of Significant Accounting Policies - Schedule of Segment Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Grant revenue |  | $ 322,569 | $ 1,939,751 | $ 3,997,784 | $ 7,575,972
Research and development expense |  | 6,040,442 | 5,125,097 | 15,986,865 | 11,711,746
Stock-based compensation |  | 291,717 | 271,215 | 1,149,899 | 1,068,011
Total general and administrative expenses |  | 2,326,326 | 2,210,927 | 7,974,277 | 6,850,536
Other income |  | 317,560 | 642,732 | 1,084,281 | 1,401,529
Net loss |  | (7,726,639) | (4,753,541) | (18,879,077) | (9,584,781)
Operating Segments [Member] |  |  |  |  |
Grant revenue |  | 322,569 | 1,939,751 | 3,997,784 | 7,575,972
Research and development expense |  | 6,040,442 | 5,125,097 | 15,986,865 | 11,711,746
Personnel costs, excluding stock-based compensation |  | 1,087,467 | 1,168,151 | 3,797,765 | 2,968,276
Stock-based compensation |  | 158,548 | 22,050 | 771,869 | 921,653
Professional fees |  | 711,307 | 707,725 | 2,053,984 | 2,049,828
Insurance, taxes and similar fees |  | 258,032 | 241,123 | 917,616 | 709,178
Other general and administrative expenses, including IT, facilities, supplies and similar costs | [1] | 110,972 | 71,878 | 433,043 | 201,601
Total general and administrative expenses |  | 2,326,326 | 2,210,927 | 7,974,277 | 6,850,536
Other income |  | 317,560 | 642,732 | 1,084,281 | 1,401,529
Net loss |  | (7,726,639) | (4,753,541) | (18,879,077) | (9,584,781)
Operating Segments [Member] | Dementia with Lewy bodies [Member] |  |  |  |  |
Research and development expense |  | 1,680,922 | 3,317,345 | 5,866,430 | 8,753,991
Operating Segments [Member] | Frontotemporal Dementia [Member] |  |  |  |  |
Research and development expense |  | 313,438 | 2,581 | 846,664 | 2,581
Operating Segments [Member] | Recovery After Stroke [Member] |  |  |  |  |
Research and development expense |  | 396,635 | 112,759 | 952,338 | 112,759
Operating Segments [Member] | Other Clinical and Nonclinical [Member] |  |  |  |  |
Research and development expense |  | 485,586 | 541,125 | 1,505,726 | 542,932
Operating Segments [Member] | Personnel Costs [Member] |  |  |  |  |
Research and development expense |  | 1,767,086 | 643,024 | 4,060,722 | 1,235,556
Operating Segments [Member] | Stock Based Compensation [Member] |  |  |  |  |
Research and development expense |  | 133,169 | 42,224 | 378,029 | 146,358
Operating Segments [Member] | Other Research and Development Costs [Member] |  |  |  |  |
Research and development expense | [2] | $ 1,263,606 | $ 466,039 | $ 2,376,956 | $ 917,569
[1] | Includes, among other things, costs related to IT systems, rent and other facilities, office supplies, and similar costs
[2] | Includes, among other things, CMC-related costs, shipping, packaging and storage costs, certain consulting costs, and other miscellaneous research development expenses.

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