Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Future grants of options or shares (in shares)	603,044	890,682	107,924
Shares reserved for employee stock purchase plan (in shares)	297,730	364,231	448,110
Total (in shares)	1,377,392	1,754,852	1,101,662
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	376,618	274,939	420,628
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	100,000	225,000	125,000

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

No definition available.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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