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Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]      
Inventory Valuation Reserves $ 504 $ 415  
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 $ 2,168 1,060 $ 928
Research and Development Expense, Total 1,600 1,500 1,500
Proportionate Net Income 1,600 1,700 3,000
Proceeds from Sale of Property, Plant, and Equipment, Total 5 2,568 0
Gain (Loss) On Sale Of Property Plant Equipment $ 5 2,158 $ (1)
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 5 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