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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Finite-lived, Gross Carrying Amount | $ 12,080 | $ 12,080 |
Finite-lived, Accumulated Amortization | 6,369 | 5,136 |
Net Carrying Amount | 5,711 | 6,944 | $ 8,201
Intangible Assets, Gross Carrying Amount | 18,790 | 18,790 |
Net Carrying Amount | 12,421 | 13,654 |
Trademarks [Member] |  |  |
Indefinite-lived, Gross Carrying Amount | 6,710 | 6,710 |
Net Carrying Amount | 6,710 | 6,710 |
Customer Relationships [Member] |  |  |
Finite-lived, Gross Carrying Amount | 10,480 | 10,480 |
Finite-lived, Accumulated Amortization | 4,912 | 3,805 |
Net Carrying Amount | 5,568 | 6,675 |
Patented Technology [Member] |  |  |
Finite-lived, Gross Carrying Amount | 600 | 600 |
Finite-lived, Accumulated Amortization | 477 | 380 |
Net Carrying Amount | 123 | 220 |
Patents [Member] |  |  |
Finite-lived, Gross Carrying Amount | 590 | 590 |
Finite-lived, Accumulated Amortization | 570 | 541 |
Net Carrying Amount | 20 | 49 |
Computer Software, Intangible Asset [Member] |  |  |
Finite-lived, Gross Carrying Amount | 270 | 270 |
Finite-lived, Accumulated Amortization | 270 | 270 |
Net Carrying Amount |  |  |
Trade Names [Member] |  |  |
Finite-lived, Gross Carrying Amount | 140 | 140 |
Finite-lived, Accumulated Amortization | 140 | 140 |
Net Carrying Amount |  |  |

X
- 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/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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