Nature of Operations and Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Land	$ 1,943	$ 1,943
Buildings and leasehold improvements	16,768	16,392
Machinery and equipment	27,458	24,453
Total cost	46,169	42,788
Accumulated depreciation and amortization	(30,671)	(28,502)
Property, Plant and Equipment	$ 15,498	$ 14,286

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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