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Note 11 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 29,197 $ 23,308 $ 56,186 $ 47,079
Instruments, Equipment, Software, and Accessories [Member]        
Revenues 27,992 22,069 53,819 45,006
Service, Maintenance, and Warranty Contracts [Member]        
Revenues $ 1,205 $ 1,239 $ 2,367 $ 2,073