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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Finite-lived, Gross Carrying Amount | $ 12,080 |  | $ 12,080
Finite-lived, Accumulated Amortization | 6,673 |  | 6,369
Net Carrying Amount, finite-lived | 5,407 | $ 5,711 | 5,711
Intangible Assets, Gross Carrying Amount | 18,790 |  | 18,790
Net Carrying Amount | 12,117 | $ 12,421 | 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 | 5,191 |  | 4,912
Net Carrying Amount, finite-lived | 5,289 |  | 5,568
Patented Technology [Member] |  |  |
Finite-lived, Gross Carrying Amount | 600 |  | 600
Finite-lived, Accumulated Amortization | 498 |  | 477
Net Carrying Amount, finite-lived | 102 |  | 123
Patents [Member] |  |  |
Finite-lived, Gross Carrying Amount | 590 |  | 590
Finite-lived, Accumulated Amortization | 574 |  | 570
Net Carrying Amount, finite-lived | 16 |  | 20
Computer Software, Intangible Asset [Member] |  |  |
Finite-lived, Gross Carrying Amount | 270 |  | 270
Finite-lived, Accumulated Amortization | 270 |  | 270
Net Carrying Amount, finite-lived |  |  |
Trade Names [Member] |  |  |
Finite-lived, Gross Carrying Amount | 140 |  | 140
Finite-lived, Accumulated Amortization | 140 |  | 140
Net Carrying Amount, finite-lived |  |  |

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