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Fair Value Measurements (Schedule of Fair Value Assets Measured on Recurring Basis) (Details) (USD $)
 6 Months Ended 1 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
TowerJazz [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Dec. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Money market funds       $ 16,410,000 [1] $ 21,907,000 [1] $ 16,410,000 [1] $ 21,907,000 $ 0 [1] $ 0 [1] $ 0 [1] $ 0 [1]
Investment in TowerJazz Semiconductor Ltd.       0 [2] 345,000 [2] 0 [2] 345,000 0 [2] 0 [2] 0 [2] 0 [2]
Total assets       16,410,000 22,252,000 16,410,000 22,252,000 0 0 0 0
Shares sold during the period     42,970                
Gain on sale of TowerJazz Semiconductor Ltd. Shares     181,000                
Proceeds from sale of TowerJazz Semiconductor Ltd. Shares $ 265,000 $ 0 $ 265,000                
[1] Money market funds are presented as a part of cash and cash equivalents on the accompanying consolidated balance sheets as of June 30, 2013 and December 30, 2012.
[2] In June 2013, the Company sold 42,970 of the remaining shares of TowerJazz marketable securities for a gain of $181,000 and cash proceeds of $265,000.