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Intangible Assets (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 30, 2017
Intangible Assets Details 1    
2019 $ 246  
2020 241  
2021 222  
2022 185  
2023 156  
Thereafter 497  
Intangible assets $ 1,547 $ 1,651