Marketable Securities and Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on securities, net of tax	$ 6	$ (9)	$ 79
Marketable securities	2,906	2,447
Marketable Securities and Investments	32,134	19,230
Equity Securities without Readily Determinable Fair Value, Amount	29,228	16,783
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	1,109	1,037
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	752	671
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(357)	(366)
Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	7	22
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	7	22
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Other [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	2,210	1,817
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	2,147	1,754
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(63)	(63)
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	3,326	2,876
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	2,906	2,447
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (420)	$ (429)

Marketable Securities and Investments

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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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.

+ References

No definition available.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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No definition available.

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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.

+ References

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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-Subparagraph (e)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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