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Note 3 - Revenues - Revenue by Geographic Destination (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total revenues $ 23,097 $ 28,759 $ 47,609 $ 58,734
UNITED STATES        
Total revenues 10,805 12,336 21,788 24,638
Europe [Member]        
Total revenues 6,535 9,332 13,113 16,773
Greater China [Member]        
Total revenues 3,249 4,136 7,631 10,335
Rest of the World [Member]        
Total revenues $ 2,508 $ 2,955 $ 5,077 $ 6,988