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Note 10 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allocated Share-based Compensation Expense $ 3,152 $ 8,194 $ 2,101
Research and Development Expense [Member]      
Allocated Share-based Compensation Expense 901 4,124 630
General and Administrative Expense [Member]      
Allocated Share-based Compensation Expense $ 2,251 $ 4,070 $ 1,471