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Note 3 - Supplemental Balance Sheet - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cost	$ 16,109	$ 16,344
Accumulated Amortization	9,605	9,259
Net	6,504	7,085
Trademarks [Member]
Cost	3,405	3,411
Accumulated Amortization	0
Net	3,405	3,411
Customer Relationships [Member]
Cost	6,471	6,618
Accumulated Amortization	4,392	4,208
Net	2,079	2,410
Patented Technology [Member]
Cost	5,486	5,545
Accumulated Amortization	4,725	4,595
Net	761	950
Distributor Relationships [Member]
Cost	377	377
Accumulated Amortization	377	377
Net
Trade Names [Member]
Cost	370	393
Accumulated Amortization	111	79
Net	$ 259	$ 314

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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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
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-SubTopic 340
-Section 50
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