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Note 11 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 26,989 $ 23,771
Instruments, Equipment, Software, and Accessories [Member]    
Revenues 25,827 22,937
Service, Maintenance, and Warranty Contracts [Member]    
Revenues $ 1,162 $ 834