Acqusitions (Details) (Anter [Member], USD $)	9 Months Ended
	Oct. 01, 2011	Jul. 18, 2011
Business Acquisition [Line Items]
Accounts receivable acquired		$ 330,000
Inventory acquired		903,000
Other assets acquired		65,000
Goodwill acquired		6,080,000
Intangible assets acquired		3,910,000
Total assets acquired		11,288,000
Accrued expenses and other current liabilities acquired		288,000
Cash paid for acquired entity		11,000,000
Weighted-average useful life of acquired intangible assets	9
Expected incremental annual sales from acquired entity	$ 6,000,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible assets	6
Unpatented Technology [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible assets	10