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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 28, 2013
Segment
Dec. 29, 2012
Dec. 31, 2011
Nature of Operations and Summary of Significant Accounting Policies [Abstract]      
Number of reportable segments 2    
Revenue Recognition and Accounts Receivable [Abstract]      
Percentage of completion revenue $ 19,758,000 $ 42,190,000 $ 29,207,000
Banker's acceptance drafts 10,765,000 9,794,000  
Changes in the carrying amount of accrued warranty costs [Roll Forward]      
Balance at beginning of year 4,462,000 4,129,000  
Provision charged to income 1,565,000 1,775,000  
Usage (2,114,000) (1,544,000)  
Acquired 567,000 0  
Currency translation 91,000 102,000  
Balance at end of year 4,571,000 4,462,000 4,129,000
Restricted Cash [Abstract]      
Restricted cash 168,000 0  
Supplemental Cash Flow Information [Abstract]      
Cash Paid for Interest 961,000 856,000 1,106,000
Cash Paid for Income Taxes 8,375,000 9,326,000 6,677,000
Non-Cash Investing Activities [Abstract]      
Fair value of assets acquired 88,398,000 0 21,808,000
Cash paid for acquired businesses (67,453,000) 0 (16,104,000)
Liabilities assumed of acquired businesses 20,945,000 0 5,704,000
Non-Cash Financing Activities [Abstract]      
Issuance of company common stock 2,677,000 2,106,000 2,296,000
Dividends Declared but Unpaid 1,389,000 0 0
Inventories [Abstract]      
Raw materials and supplies 20,836,000 19,561,000  
Work in process 21,051,000 8,371,000  
Finished goods 20,918,000 14,145,000  
Inventories 62,805,000 42,077,000  
Finished goods at customer locations 2,941,000 2,310,000  
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 117,997,000 109,046,000  
Less: accumulated depreciation and amortization 73,112,000 69,878,000  
Property, plant and equipment, net 44,885,000 39,168,000  
Depreciation and amortization expense 5,088,000 5,015,000 4,953,000
Land [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 4,797,000 3,968,000  
Buildings [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 38,363,000 36,823,000  
Buildings [Member] | Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Buildings [Member] | Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 40 years    
Machinery and Equipment [Member] | Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 2 years    
Machinery and Equipment [Member] | Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Machinery, Equipment and Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 74,837,000 68,255,000  
Composites LLC [Member]
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amount paid for lawsuit claim   $ 647,000