Note 8 - Stock-based Compensation - Schedule of Stock Based Compensation Award Activity (Details)	6 Months Ended
Jul. 03, 2022 shares
Balance (in shares)	93,000
Balance (in shares)	84,000
Restricted Stock Units (RSUs) [Member]
RSUs granted (in shares)	(99)
RSUs forfeited or expired (in shares)	22
Stock Plan 2019 [Member]
Balance (in shares)	594,000
Authorized (in shares)	908,000
Balance (in shares)	1,421,000
Stock Plan 2019 [Member] \| Restricted Stock Units (RSUs) [Member]
RSUs granted (in shares)	(99,000)
RSUs forfeited or expired (in shares)	18,000

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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