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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