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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