Note 14 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Total share-based compensation | $ 451 | $ 110 | $ 763 | $ 555 |
| Research and Development Expense [Member] | ||||
| Total share-based compensation | 151 | 26 | 276 | 129 |
| General and Administrative Expense [Member] | ||||
| Total share-based compensation | $ 300 | $ 84 | $ 487 | $ 426 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|