Marketable Securities and Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Unrealized (losses) gains on securities, net of tax	$ (16)	$ 6	$ (9)
Marketable securities	2,154	2,906
Marketable Securities and Investments	50,780	32,134
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	584	1,109
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	203	752
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(381)	(357)
Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	7	7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	7	7
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	2,007	2,210
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	1,944	2,147
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	2,598	3,326
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Market value	2,154	2,906
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (444)	$ (420)

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=121645371&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.

+ References

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

No definition available.

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- Definition

Amount, after tax and before adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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-Publisher FASB
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-Section 45
-Paragraph 11
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- Definition

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.

+ References

No definition available.

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