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Note 18 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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