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Note 16 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Total revenues | $ 23,771 | $ 28,202
Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 22,937 | 26,757
Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 834 | 1,445
UNITED STATES |  |
Total revenues | 16,531 | 19,814
UNITED STATES | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 15,956 | 18,671
UNITED STATES | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 575 | 1,143
UNITED KINGDOM |  |
Total revenues | 2,711 | 3,319
UNITED KINGDOM | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 2,507 | 3,129
UNITED KINGDOM | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 204 | 190
GERMANY |  |
Total revenues | 2,612 | 3,010
GERMANY | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 2,573 | 2,913
GERMANY | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 39 | 97
Rest of the World [Member] |  |
Total revenues | 1,917 | 2,059
Rest of the World [Member] | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 1,901 | 2,044
Rest of the World [Member] | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | $ 16 | $ 15

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