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The Company and Basis of Presentation (Details) (USD $)
Mar. 31, 2013
Dec. 30, 2012
Apr. 01, 2012
Jan. 01, 2012
Liquidity [Line Items]        
Cash and cash equivalents $ 19,659,000 $ 22,578,000 $ 17,223,000 $ 20,203,000
TowerJazz [Member]
       
Liquidity [Line Items]        
Investment in TowerJazz Semiconductor Ltd. 303,000      
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
       
Liquidity [Line Items]        
Line of credit facility, maximum borrowing capacity $ 6,000,000