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Investment in TowerJazz Semiconductor Ltd. (Details) (TowerJazz [Member], USD $)	0 Months Ended	3 Months Ended
	Aug. 03, 2012	Sep. 30, 2012	Dec. 30, 2012
TowerJazz [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of shares held			42,970
Net unrealized gain (loss) on available-for-sale securities			$ (11,000)
Available-for-sale securities, cost per share (in dollars per share)			$ 1.95
Available-for-sale securities, carrying value per share (in dollars per share)			$ 8.04
Reverse stock split, conversion ratio	0.0667
Income tax benefit on sale of TowerJazz investment sale		$ (63,000)

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