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Note 10 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues $ 29,208 $ 29,197 $ 57,986 $ 56,186
Instruments, Equipment, Software, and Accessories [Member]        
Revenues 27,765 27,992 55,303 53,819
Service, Maintenance, and Warranty Contracts [Member]        
Revenues $ 1,443 $ 1,205 $ 2,683 $ 2,367