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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

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