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Property and Equipment (Tables)
12 Months Ended
Dec. 26, 2020
Property, Plant and Equipment [Abstract]  
Property and equipment
   2020  2019
Computer equipment and software  $1,170   $989 
Shop equipment   1,683    1,301 
Furniture and fixtures   193    190 
Leasehold improvements   845    623 
Autos and trucks   87    87 
Construction in progress   —      141 
   $3,978   $3,331 
Accumulated depreciation and amortization   (2,715)   (2,298)
Property and equipment, net  $1,263   $1,033