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Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Intangible assets, gross amount $ 8,720 $ 8,632
Intangible assets, accumulated amortization (4,928) (4,796)
Intangible assets, net 3,792 3,836
Patents [Member]    
Intangible assets, gross amount 8,683 8,597
Intangible assets, accumulated amortization (4,910) (4,779)
Intangible assets, net 3,773 3,818
Trademarks [Member]    
Intangible assets, gross amount 37 35
Intangible assets, accumulated amortization (18) (17)
Intangible assets, net $ 19 $ 18