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Note 2 - Summary of Significant Accounting Policies (Details Textual) |  |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 16, 2024 USD ($) | Jul. 15, 2024 USD ($) | Sep. 30, 2024 | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | May 07, 2024 $ / shares | Jan. 03, 2024 $ / shares
Government Assistance, Income, Increase (Decrease) |  |  |  | $ 0 | $ 0 | $ 900,000 |  |
Class of Warrant or Right, Fair Value of Common Stock Warrants per Warrant (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 6.71
Class of Warrant or Right, Redemption Price per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 |
Number of Operating Segments |  |  |  | 1 |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | $ (116,929,000) | (82,025,000) | $ (77,514,000) |  |
Proceeds from Insurance Settlement, Operating Activities |  |  |  | 9,900,000 | $ 100,000 |  |  |
Insurance Settlements, Maximum Recovery Limit |  |  |  | $ 10,000,000 |  |  |  |
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Research and development |  |  |  |
Former Senior Vice President [Member] |  |  |  |  |  |  |  |
Consulting Agreement, Term | 1 |  |  |  |  |  |  |
Consulting Service, Price Per Hour | $ 500 |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 43,000 |  |  |  |
Former President and Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Severance Costs |  | $ 1,230,000 |  |  |  |  |  |
Former Senior Vice President [Member] |  |  |  |  |  |  |  |
Severance Costs | $ 500,000 |  |  |  |  |  |  |
Former Senior Officer [Member] |  |  |  |  |  |  |  |
Severance Costs |  |  |  | $ 1,200,000 |  |  |  |
Number of Former Employees |  |  | 2 |  |  |  |  |
Building [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 39 years |  |  |  |
Building Improvements [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 10 years |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |  |  |

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