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Note 10 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues $ 26,922 $ 29,663 $ 84,908 $ 85,849
Instruments, Equipment, Software, and Accessories [Member]        
Revenues 25,705 28,485 81,008 82,304
Service, Maintenance, and Warranty Contracts [Member]        
Revenues $ 1,217 $ 1,178 $ 3,900 $ 3,545