Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details Textual)

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Acquisitions (Details Textual) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Apr. 01, 2013
Mar. 30, 2013
Dec. 29, 2012
Jun. 29, 2013
WhiteOak [Member]
Apr. 01, 2013
WhiteOak [Member]
Oct. 18, 2012
Seungwon Solutions Corporation [Member]
Jun. 29, 2013
Trade Name
Apr. 01, 2013
Trade Name
WhiteOak [Member]
Jun. 29, 2013
Noncompete Agreements [Member]
Apr. 01, 2013
Noncompete Agreements [Member]
WhiteOak [Member]
Jun. 29, 2013
Technology
WhiteOak [Member]
Apr. 01, 2013
Technology
WhiteOak [Member]
Jun. 29, 2013
Developed Technology Rights [Member]
WhiteOak [Member]
Apr. 01, 2013
Developed Technology Rights [Member]
WhiteOak [Member]
Business Acquisition [Line Items]                                
Purchase of Remaining Interest in Equity Investee     60.00%                          
Purchase of outstanding stock     $ 1,000         $ 1,458                
Goodwill arising from acquisition 5,082       4,472   726 1,731                
Acquired definite lived intangible assets             746     18   11   276   441
Acquisition related costs           12                    
Finite-Lived Intangible Asset, Useful Life                 1 year   2 years   15 years   10 years  
Gain on Purchase of Business 528 0       528                    
Equity Method Investment, Ownership Percentage       40.00%                        
Percentage of sale of component supplier               80.00%                
Transaction cost arising from acquisition               $ 80