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Note 4 - Supplemental Balance Sheet - Composition of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Cost | $ 16,344 | $ 15,990
Accumulated Amortization | 9,259 | 8,796
Net | 7,085 | 7,194
Trademarks [Member] |  |
Cost | 3,411 | 3,404
Accumulated Amortization | 0 |
Net | 3,411 | 3,404
Customer Relationships [Member] |  |
Cost | 6,618 | 6,395
Accumulated Amortization | 4,208 | 3,975
Net | 2,410 | 2,420
Patented Technology [Member] |  |
Cost | 5,545 | 5,455
Accumulated Amortization | 4,595 | 4,417
Net | 950 | 1,038
Distributor Relationships [Member] |  |
Cost | 377 | 377
Accumulated Amortization | 377 | 368
Net |  | 9
Trade Names [Member] |  |
Cost | 393 | 359
Accumulated Amortization | 79 | 36
Net | $ 314 | $ 323

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- 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/presentationRef -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 + Details
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- 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/presentationRef -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 + Details
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