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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Segment
Jun. 29, 2013
Segment
Jun. 30, 2012
Segment
Dec. 29, 2012
Nature of Operations and Summary of Significant Accounting Policies [Abstract]        
Number of reportable segments 1 1 1  
Cash Flow, Noncash Investing Activities Disclosure [Abstract]        
Fair value of assets acquired   $ 22,812,000 $ 0  
Cash paid for acquired businesses   (15,332,000) 0  
Liabilities assumed of acquired businesses   7,480,000 0  
Cash Flow, Noncash Financing Activities Disclosure [Abstract]        
Issuance of Company common stock   2,353,000 1,829,000  
Dividends declared but unpaid 1,395,000 1,395,000 0  
Restricted Cash [Abstract]        
Restricted Cash 165,000 165,000   0
Banker's Acceptance Drafts [Abstract]        
Banker's acceptance drafts 8,197,000 8,197,000   9,794,000
Inventories [Abstract]        
Raw Materials and Supplies 20,245,000 20,245,000   19,561,000
Work in Process 17,658,000 17,658,000   8,371,000
Finished Goods 16,149,000 16,149,000   14,145,000
Inventories 54,052,000 54,052,000   42,077,000
Changes in the carrying amount of accrued warranty costs [Roll Forward]        
Balance at beginning of period   4,462,000 4,129,000  
Provision   505,000 486,000  
Usage   (996,000) (841,000)  
Standard Product Warranty Accrual, Additions from Business Acquisition   138,000 0  
Currency translation   (44,000) (41,000)  
Balance at end of period $ 4,065,000 $ 4,065,000 $ 3,733,000