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Note 4 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cost	$ 20,074	$ 20,039
Accumulated Amortization	10,997	10,830
Net	9,077	9,209
Trademarks [Member]
Cost	3,410	3,410
Accumulated Amortization	0	0
Net	3,410	3,410
Customer Relationships [Member]
Cost	9,193	9,171
Accumulated Amortization	5,215	5,115
Net	3,978	4,056
Patented Technology [Member]
Cost	5,567	5,557
Accumulated Amortization	5,051	5,014
Net	516	543
Distributor Relationships [Member]
Cost	377	377
Accumulated Amortization	377	377
Net	0	0
Trade Names [Member]
Cost	1,527	1,524
Accumulated Amortization	354	324
Net	$ 1,173	$ 1,200

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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X

- Definition

Amount before 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 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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