Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Equity - Stock based Compensation (Details)

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Note 5 - Equity - Stock based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-based compensation expense $ 977 $ 460 $ 1,817 $ 1,265
General and Administrative Expense [Member]        
Stock-based compensation expense 443 366 1,085 1,029
Research and Development Expense [Member]        
Stock-based compensation expense $ 534 $ 94 $ 732 $ 236