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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Total share-based compensation $ 365 $ 446 $ 673 $ 957
Research and Development Expense [Member]        
Total share-based compensation 108 140 199 271
General and Administrative Expense [Member]        
Total share-based compensation $ 257 $ 306 $ 474 $ 686