Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Jul. 03, 2021	Jan. 02, 2021
Future grants of options or shares (in shares)	209,180	520,929
Shares reserved for employee stock purchase plan (in shares)	95,988	149,894
Total (in shares)	1,019,214	1,380,628
Time-based Restricted Stock Units [Member]
Time-based restricted stock units outstanding (in shares)	499,054	459,805
Unvested Subscription Restricted Share Awards [Member]
Time-based restricted stock units outstanding (in shares)	124,992	250,000
Performance-based Restricted Stock Units [Member]
Time-based restricted stock units outstanding (in shares)	90,000	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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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