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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-lived, Gross Carrying Amount | $ 12,080 | $ 12,080
Finite-lived, Accumulated Amortization | 7,287 | 6,369
Net Carrying Amount, finite-lived | 4,793 | 5,711
Intangible Assets, Gross Carrying Amount | 18,790 | 18,790
Net Carrying Amount | 11,503 | 12,421
Trademarks [Member] |  |
Indefinite-lived, Gross Carrying Amount | 6,710 | 6,710
Net Carrying Amount, indefinite-lived | 6,710 | 6,710
Customer Relationships [Member] |  |
Finite-lived, Gross Carrying Amount | 10,480 | 10,480
Finite-lived, Accumulated Amortization | 5,767 | 4,912
Net Carrying Amount, finite-lived | 4,713 | 5,568
Patented Technology [Member] |  |
Finite-lived, Gross Carrying Amount | 600 | 600
Finite-lived, Accumulated Amortization | 528 | 477
Net Carrying Amount, finite-lived | 72 | 123
Patents [Member] |  |
Finite-lived, Gross Carrying Amount | 590 | 590
Finite-lived, Accumulated Amortization | 582 | 570
Net Carrying Amount, finite-lived | 8 | 20
Computer Software, Intangible Asset [Member] |  |
Finite-lived, Gross Carrying Amount | 270 | 270
Finite-lived, Accumulated Amortization | 270 | 270
Net Carrying Amount, finite-lived | 0 | 0
Trade Names [Member] |  |
Finite-lived, Gross Carrying Amount | 140 | 140
Finite-lived, Accumulated Amortization | 140 | 140
Net Carrying Amount, finite-lived | $ 0 | $ 0

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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/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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