Note 4 - Prepaid Expense and Other Current Assets - Schedule of Prepaid Expense and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Prepaid insurance	$ 1,185	$ 1,078
Prepaid clinical development costs	848	871
Other prepaid expense	421	334
Other current receivables	6	6
Total prepaid expense and other current assets	$ 2,460	$ 2,289