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Note 4 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accrued research and development $ 1,337 $ 1,005
Accrued payroll and bonuses 748 606
Accrued legal, regulatory, professional and other 437 442
Accrued liabilities due to related party 86 109
Total accrued expenses and other current liabilities 2,724 2,258
Accounts Payable and Accrued Liabilities [Member]    
Operating lease liability - current $ 116 $ 96