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Note 8 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total share-based compensation $ 184 $ 317 $ 388 $ 595
Research and Development Expense [Member]        
Total share-based compensation 102 134 217 273
Selling, General and Administrative Expenses [Member]        
Total share-based compensation $ 82 $ 183 $ 171 $ 322