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Note 6 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cost | $ 19,748 | $ 16,109
Accumulated Amortization | 9,816 | 9,605
Net | 9,932 | 6,504
Trademarks [Member] |  |
Cost | 3,405 | 3,405
Accumulated Amortization | 0 | 0
Net | 3,405 | 3,405
Customer Relationships [Member] |  |
Cost | 8,986 | 6,471
Accumulated Amortization | 4,509 | 4,392
Net | 4,477 | 2,079
Patented Technology [Member] |  |
Cost | 5,483 | 5,486
Accumulated Amortization | 4,789 | 4,725
Net | 694 | 761
Distributor Relationships [Member] |  |
Cost | 377 | 377
Accumulated Amortization | 377 | 377
Net |  |
Trade Names [Member] |  |
Cost | 1,497 | 370
Accumulated Amortization | 141 | 111
Net | $ 1,356 | $ 259

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