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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
Dec. 30, 2012
Jan. 01, 2012
Fair Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 21,907,000 [1] $ 18,826,000 [1]
Investment in TowerJazz Semiconductor Ltd. 345,000 [2] 406,000 [2]
Total assets 22,252,000 19,232,000
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 21,907,000 [1] 18,826,000 [1]
Investment in TowerJazz Semiconductor Ltd. 345,000 [2] 406,000 [2]
Total assets 22,252,000 19,232,000
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 [1] 0 [1]
Investment in TowerJazz Semiconductor Ltd. 0 [2] 0 [2]
Total assets 0 0
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 [1] 0 [1]
Investment in TowerJazz Semiconductor Ltd. 0 [2] 0 [2]
Total assets $ 0 $ 0
[1] Money market funds are presented as a part of cash and cash equivalents on the accompanying consolidated balance sheets as of December 30, 2012 and January 1, 2012.
[2] The Company expects to sell TowerJazz marketable securities at the fair market value at such time as it deems appropriate.