Note 4 - Prepaid Expenses and Other - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CRO services	$ 6	$ 431
Other clinical development	534	1,408
Insurance	1,403	2,318
Professional fees	1,081	300
Other	1,393	1,445
Total, long-term	4,417	5,902
Other clinical development	210	0
Other	2,524	2,069
Prepaid Expense and Other Assets, Noncurrent	2,734	2,069
Totals	$ 7,151	$ 7,971