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Note 5 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cost | $ 20,039 | $ 19,892
Accumulated Amortization | 10,830 | 10,171
Net | 9,209 | 9,721
Trademarks [Member] |  |
Cost | 3,410 | 3,403
Accumulated Amortization | 0 | 0
Net | 3,410 | 3,403
Customer Relationships [Member] |  |
Cost | 9,171 | 9,080
Accumulated Amortization | 5,115 | 4,721
Net | 4,056 | 4,359
Patented Technology [Member] |  |
Cost | 5,557 | 5,521
Accumulated Amortization | 5,014 | 4,869
Net | 543 | 652
Distributor Relationships [Member] |  |
Cost | 377 | 377
Accumulated Amortization | 377 | 377
Net | 0 | 0
Trade Names [Member] |  |
Cost | 1,524 | 1,511
Accumulated Amortization | 324 | 204
Net | $ 1,200 | $ 1,307

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