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Note 4 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Accrued research and development $ 2,845 $ 1,337
Accrued payroll and bonuses 765 748
Accrued legal, regulatory, professional and other 547 437
Total accrued expenses and other current liabilities 4,317 2,724
Related Party [Member]    
Total accrued expenses and other current liabilities 60 86
Accrued Expense And Other Curent Liabilities [Member]    
Operating lease liability - current $ 100 $ 116