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Note 5 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Cost	$ 19,800	$ 19,892
Accumulated Amortization	10,588	10,171
Net	9,212	9,721
Trademarks [Member]
Cost	3,406	3,403
Accumulated Amortization	0	0
Net	3,406	3,403
Customer Relationships [Member]
Cost	9,020	9,080
Accumulated Amortization	4,975	4,721
Net	4,045	4,359
Patented Technology [Member]
Cost	5,496	5,521
Accumulated Amortization	4,952	4,869
Net	544	652
Distributor Relationships [Member]
Cost	377	377
Accumulated Amortization	377	377
Net	0	0
Trade Names [Member]
Cost	1,501	1,511
Accumulated Amortization	284	204
Net	$ 1,217	$ 1,307

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
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