Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Share-based Compensation - Share-based Compensation Expense (Details)

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Note 12 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total share-based compensation $ 380 $ 365 $ 802 $ 673
Research and Development Expense [Member]        
Total share-based compensation 140 108 272 199
General and Administrative Expense [Member]        
Total share-based compensation $ 240 $ 257 $ 530 $ 474