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Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Intangible assets, gross amount | $ 9,727 | $ 9,640
Intangible assets, accumulated amortization | (6,117) | (6,012)
Intangible assets, net | 3,610 | 3,628
Patents [Member] |  |
Intangible assets, gross amount | 9,553 | 9,502
Intangible assets, accumulated amortization | (6,081) | (5,981)
Intangible assets, net | 3,472 | 3,521
Trademarks [Member] |  |
Intangible assets, gross amount | 174 | 138
Intangible assets, accumulated amortization | (36) | (31)
Intangible assets, net | $ 138 | $ 107

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