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12. Deposits and other assets (Tables)
 12 Months Ended
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of deposits and other assets
    December 30, 2017     December 31, 2016  
Deposits   $ 411     $ 232  
Other     107       104  
    $ 518     $ 336