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Note 7 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accrued expenses | $ 22 | $ 75
Accrued salaries and employee benefits | 641 | 661
Accrued clinical trial costs | 356 | 1,017
Grant liability | 468 | 471
Customer deposits | 64 | 90
Total | 1,551 | 2,385
Related Party [Member] |  |
Payable to related party | $ 0 | $ 71

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