Marketable Securities and Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Unrealized (losses) gains on securities, net of tax	$ 14	$ 8	$ 30
Marketable securities	1,568	1,319
Marketable securities and investments	1,568us-gaap_MarketableSecuritiesNoncurrent	1,319us-gaap_MarketableSecuritiesNoncurrent
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1,110	871
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7	0
Market value	1,002	740
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(115)	(131)
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	88	308
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	88	308
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	541	334
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	478	271
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(63)	(63)
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1,739	1,513
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7	0
Market value	1,568	1,319
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (178)	$ (194)

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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