Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Accrued Liabilities [Line Items]
Employee compensation	$ 2,813	$ 2,590
Customer related allowances and accruals	6,324	5,749
Other accrued items	4,860	4,453
Accrued Liabilities	$ 13,997	$ 12,792