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Note 4 - Accrued Expenses and Other Current Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Accrued research and development |  | $ | 1,337 |  |  | $ | 1,005 |
Accrued payroll and bonuses |  |  | 748 |  |  |  | 606 |
Accrued legal, regulatory, professional and other |  |  | 437 |  |  |  | 442 |
Operating lease liability - current |  |  | 116 |  |  |  | 96 |
Accrued liabilities due to related party |  |  | 86 |  |  |  | 109 |
Total accrued expenses and other current liabilities |  | $ | 2,724 |  |  | $ | 2,258 |

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