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Note 4 - Supplemental Balance Sheet - Composition of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cost | $ 15,990 | $ 12,234
Accumulated Amortization | 8,796 | 8,288
Net | 7,194 | 3,946
Trademarks [Member] |  |
Cost | 3,404 | 3,411
Accumulated Amortization | 0 |
Net | 3,404 | 3,411
Customer Relationships [Member] |  |
Cost | 6,395 | 3,971
Accumulated Amortization | 3,975 | 3,716
Net | 2,420 | 255
Patented Technology [Member] |  |
Cost | 5,455 | 4,482
Accumulated Amortization | 4,417 | 4,217
Net | 1,038 | 265
Distributor Relationships [Member] |  |
Cost | 377 | 370
Accumulated Amortization | 368 | 355
Net | 9 | $ 15
Trade Names [Member] |  |
Cost | 359 |
Accumulated Amortization | 36 |
Net | $ 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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