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Note 8 - Segment Reporting - Revenue From External Customers by Geographic Areas (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue $ 611 $ 956 $ 1,237 $ 1,994
UNITED STATES        
Revenue 209 437 470 1,000
Non-US [Member]        
Revenue $ 402 $ 519 $ 767 $ 994