Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands |
Sep. 30, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Intangible assets, gross amount | $ 8,915 | $ 8,632 |
| Intangible assets, accumulated amortization | (5,175) | (4,796) |
| Intangible assets, net | 3,740 | 3,836 |
| Patents [Member] | ||
| Intangible assets, gross amount | 8,865 | 8,597 |
| Intangible assets, accumulated amortization | (5,155) | (4,779) |
| Intangible assets, net | 3,710 | 3,818 |
| Trademarks [Member] | ||
| Intangible assets, gross amount | 50 | 35 |
| Intangible assets, accumulated amortization | (20) | (17) |
| Intangible assets, net | $ 30 | $ 18 |