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Note 9 - Stock Based Awards - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stock-based compensation expense $ 2,257 $ 1,966
Research and Development Expense [Member]    
Stock-based compensation expense 932 536
General and Administrative Expense [Member]    
Stock-based compensation expense $ 1,325 $ 1,430