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Note 18 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Total revenues | $ 116,176 | $ 120,774
Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 110,220 | 115,068
Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 5,956 | 5,706
UNITED STATES |  |
Total revenues | 82,938 | 84,052
UNITED STATES | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 78,196 | 79,614
UNITED STATES | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 4,742 | 4,438
UNITED KINGDOM |  |
Total revenues | 11,426 | 14,522
UNITED KINGDOM | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 10,607 | 13,690
UNITED KINGDOM | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 819 | 832
GERMANY |  |
Total revenues | 13,672 | 13,559
GERMANY | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 13,359 | 13,193
GERMANY | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | 313 | 366
Rest of the World [Member] |  |
Total revenues | 8,140 | 8,641
Rest of the World [Member] | Instruments, Equipment, Software, and Accessories [Member] |  |
Total revenues | 8,058 | 8,571
Rest of the World [Member] | Service, Maintenance, and Warranty Contracts [Member] |  |
Total revenues | $ 82 | $ 70

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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