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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $)
 6 Months Ended
Jun. 28, 2014
Segment
Jun. 29, 2013
Dec. 28, 2013
Nature of Operations and Summary of Significant Accounting Policies [Abstract]      
Number of reportable segments 2    
Cash Flow, Noncash Investing Activities Disclosure [Abstract]      
Fair value of assets acquired $ 5,602,000 $ 22,812,000  
Cash paid for acquired businesses (3,444,000) (15,332,000)  
Liabilities assumed of acquired businesses 2,158,000 7,480,000  
Cash Flow, Noncash Financing Activities Disclosure [Abstract]      
Issuance of Company Common Stock 2,718,000 2,353,000  
Dividends Declared but Unpaid 1,640,000 1,395,000  
Restricted Cash [Abstract]      
Restricted Cash 167,000   168,000
Banker's Acceptance Drafts [Abstract]      
Banker's acceptance drafts 9,267,000   10,765,000
Inventories [Abstract]      
Raw Materials and Supplies 22,368,000   20,836,000
Work in Process 16,587,000   21,051,000
Finished Goods 21,132,000   20,918,000
Inventories 60,087,000   62,805,000
Changes in the carrying amount of accrued warranty costs [Roll Forward]      
Balance at beginning of period 4,571,000 4,462,000  
Provision 1,284,000 505,000  
Usage (1,600,000) (996,000)  
Standard Product Warranty Accrual, Additions from Business Acquisition 0 138,000  
Currency translation (6,000) (44,000)  
Balance at end of period $ 4,249,000 $ 4,065,000