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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:
| March 31, 2021 |  | December 31, 2020
| Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net
Customer relationships | $ | 1,623 |  |  | $ | (488) |  |  | $ | 1,135 |  |  | $ | 1,661 |  |  | $ | (470) |  |  | $ | 1,191 |
Trade names | 553 |  |  | (70) |  |  | 483 |  |  | 565 |  |  | (65) |  |  | 500 |
Technology | 162 |  |  | (72) |  |  | 90 |  |  | 165 |  |  | (67) |  |  | 98 |
Long term supply contracts | 137 |  |  | (57) |  |  | 80 |  |  | 142 |  |  | (55) |  |  | 87 |
Patents | 17 |  |  | (12) |  |  | 5 |  |  | 16 |  |  | (12) |  |  | 4 |
| $ | 2,492 |  |  | $ | (699) |  |  | $ | 1,793 |  |  | $ | 2,549 |  |  | $ | (669) |  |  | $ | 1,880 |
Total amortization expense of intangible assets for the three ended March 31, 2021 and 2020 was $47 and $45.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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