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Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Intangible assets, gross amount | $ 9,171 | $ 9,050
Intangible assets, accumulated amortization | (5,516) | (5,351)
Intangible assets, net | 3,655 | 3,699
Patents [Member] |  |
Intangible assets, gross amount | 9,111 | 8,994
Intangible assets, accumulated amortization | (5,493) | (5,330)
Intangible assets, net | 3,618 | 3,664
Trademarks [Member] |  |
Intangible assets, gross amount | 60 | 56
Intangible assets, accumulated amortization | (23) | (21)
Intangible assets, net | $ 37 | $ 35

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