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Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Intangible assets, gross amount $ 10,145 $ 10,091
Intangible assets, accumulated amortization (6,511) (6,411)
Intangible assets, net 3,634 3,680
Patents [Member]    
Intangible assets, gross amount 9,920 9,873
Intangible assets, accumulated amortization (6,448) (6,355)
Intangible assets, net 3,472 3,518
Trademarks [Member]    
Intangible assets, gross amount 225 218
Intangible assets, accumulated amortization (63) (56)
Intangible assets, net $ 162 $ 162