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Note 9 - Fair Value Measurements (Details Textual) $ in Millions	Jan. 02, 2022 USD ($)	Jan. 03, 2021 USD ($)
Measurement Input, Discount for Lack of Marketability [Member] | Minimum [Member]
Equity Securities, FV-NI, Measurement Input	34
Measurement Input, Discount for Lack of Marketability [Member] | Maximum [Member]
Equity Securities, FV-NI, Measurement Input	41
Measurement Input, Expected Term [Member] | Minimum [Member]
Equity Securities, FV-NI, Measurement Input	4
Measurement Input, Expected Term [Member] | Maximum [Member]
Equity Securities, FV-NI, Measurement Input	5
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Equity Securities, FV-NI, Measurement Input	0.75
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Equity Securities, FV-NI, Measurement Input	0.92
Measurement Input, Expected Dividend Payment [Member]
Equity Securities, FV-NI, Measurement Input	0.00
Measurement Input, Price Volatility [Member] | Minimum [Member]
Equity Securities, FV-NI, Measurement Input	63
Measurement Input, Price Volatility [Member] | Maximum [Member]
Equity Securities, FV-NI, Measurement Input	78
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	$ 19.6	$ 22.0

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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X

- Definition

Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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