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Note 10 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues $ 28,759 $ 29,208 $ 58,734 $ 57,986
Instruments, Equipment, Software, and Accessories [Member]        
Revenues 27,268 27,765 55,761 55,303
Service, Maintenance, and Warranty Contracts [Member]        
Revenues $ 1,491 $ 1,443 $ 2,973 $ 2,683