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The Company and Basis of Presentation (Narrative) (Details) (USD $)
Jul. 01, 2012
Jan. 01, 2012
Jul. 03, 2011
Jan. 02, 2011
Liquidity [Line Items]        
Cash and cash equivalents $ 26,867,000 $ 20,203,000 $ 21,439,000 $ 21,956,000
TowerJazz [Member]
       
Liquidity [Line Items]        
Investment in TowerJazz Semiconductor Ltd. 432,000      
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
       
Liquidity [Line Items]        
Line of credit facility, maximum borrowing capacity $ 6,000,000