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Inventories (Details) - USD ($)
$ in Thousands
Apr. 02, 2016
Jan. 02, 2016
Summary of inventories    
Raw materials $ 5,631 $ 5,555
Work in process 4,101 4,478
Finished goods 3,492 3,464
Provision for slow moving inventory (497) (450)
Total $ 12,727 $ 13,047