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Note 10 - Segment Information - Long Lived Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Long lived assets $ 7,097 $ 7,296
UNITED STATES    
Long lived assets 4,611 4,809
Non-US [Member]    
Long lived assets $ 2,486 $ 2,487