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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total share-based compensation $ 446 $ 436 $ 957 $ 829
Research and Development Expense [Member]        
Total share-based compensation 140 131 271 238
General and Administrative Expense [Member]        
Total share-based compensation $ 306 $ 305 $ 686 $ 591