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Intangible Assets
3 Months Ended
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, 2021December 31, 2020
 GrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$1,623 $(488)$1,135 $1,661 $(470)$1,191 
Trade names553 (70)483 565 (65)500 
Technology162 (72)90 165 (67)98 
Long term supply contracts137 (57)80 142 (55)87 
Patents17 (12)16 (12)
$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.