Note 12 - Share-based Compensation - Allocation of Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Share-based expense | $ 5,356 | $ 2,237 |
| Selling, General and Administrative Expenses [Member] | ||
| Share-based expense | 4,558 | 1,957 |
| Research and Development Expense [Member] | ||
| Share-based expense | $ 798 | $ 280 |