Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Inventory Valuation Reserves	$ 415	$ 471
Equity Method Investment, Description of Principal Activities	Where the equity interest is less than 20% and the degree of influence is not significant, the cost method of accounting is employed. Where the equity interest is greater than 20% but not more than 50%, the equity method of accounting is utilized.
Proceeds from Equity Method Investment, Dividends or Distributions	$ 1,060	928	$ 919
Research and Development Expense, Total	1,500	1,500	1,700
Proportionate Net Income	1,700	3,000	3,900
Proceeds from Sale of Property, Plant, and Equipment, Total	2,568	0	26
Gain (Loss) On Sale Of Property Plant Equipment	$ 2,158	$ (1)	$ 10
Building [Member] | Maximum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Building [Member] | Minimum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Machinery and Equipment, Leasehold Improvements [Member] | Maximum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Machinery and Equipment, Leasehold Improvements [Member] | Minimum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Tools, Dies and Molds [Member] | Maximum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Tools, Dies and Molds [Member] | Minimum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Land and Building [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 2,100
Gain (Loss) On Sale Of Property Plant Equipment	$ 1,900
Noncompete Agreements [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Patents [Member] | Maximum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Patents [Member] | Minimum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Customer Lists [Member] | Maximum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	14 years
Customer Lists [Member] | Minimum [Member]
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years