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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

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