Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Future grants of options or shares (in shares)	890,682	107,924	520,929
Shares reserved for employee stock purchase plan (in shares)	364,231	448,110	149,894
Total (in shares)	1,754,852	1,101,662	1,380,628
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	274,939	420,628	459,805
Unvested Subscription Restricted Share Awards [Member]
Restricted stock units outstanding (in shares)	0	0	250,000
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	225,000	125,000	0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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