Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 29, 2014 Segment	Mar. 30, 2013 Segment	Dec. 28, 2013
Nature of Operations and Summary of Significant Accounting Policies [Abstract]
Number of reportable segments	2	1
Cash Flow, Noncash Investing Activities Disclosure [Abstract]
Fair value of assets acquired	$ 5,610,000	$ 0
Cash paid for acquired businesses	(2,709,000)	0
Liabilities assumed of acquired businesses	2,901,000	0
Cash Flow, Noncash Financing Activities Disclosure [Abstract]
Issuance of Company Common Stock	2,480,000	2,191,000
Dividends Declared but Unpaid	1,676,000	1,401,000
Restricted Cash [Abstract]
Restricted Cash	162,000		168,000
Banker's Acceptance Drafts [Abstract]
Banker's acceptance drafts	6,947,000		10,765,000
Inventories [Abstract]
Raw Materials and Supplies	21,042,000		20,836,000
Work in Process	20,980,000		21,051,000
Finished Goods	19,940,000		20,918,000
Inventories	61,962,000		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	559,000	291,000
Usage	(697,000)	(555,000)
Currency translation	(9,000)	(79,000)
Balance at end of period	$ 4,424,000	$ 4,119,000