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Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Accrued expenses $ 4 $ 75
Accrued salaries and employee benefits 677 661
Accrued clinical trial costs 1,004 1,017
Grant liability 470 471
Customer deposits 69 90
Total 2,266 2,385
Related Party [Member]    
Payable to related party $ 42 $ 71