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Note 11 - Business Segment and Geographic Financial Data - Geographic Segment Financial Data (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues $ 7,042 $ 5,461 $ 11,999 $ 12,748  
Assets 48,994   48,994   $ 50,388
UNITED STATES          
Revenues 4,471 4,316 8,066 10,297  
Assets 45,525   45,525   46,487
Non-US [Member]          
Revenues 2,571 $ 1,145 3,933 $ 2,451  
Assets $ 3,469   $ 3,469   $ 3,901