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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