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Note 3 - Balance Sheet Details - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Notes To Financial Statements [Abstract]    
Accrued accounts payable $ 109 $ 146
Accrued clinical trial expenses 0 20
Accrued chemistry, manufacturing and controls ("CMC") expenses 606 5
Accrued director stipends 59 106
Accrued severance and benefits 0 131
Accrued joint development expenses 223 98
Current portion of contingent consideration obligation 0 143
Accrued other 243 182
Accrued Liabilities, current, Total $ 1,240 $ 831