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Note 5 - Accrued Expenses - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued compensation and related expenses $ 480 $ 443
Accrued professional fees 163 174
Accrued clinical trial expenses 618 497
Other 113 237
Accrued Liabilities, Current, Total $ 1,374 $ 1,351