Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Jan. 02, 2021	Dec. 28, 2019
Future grants of options or shares (in shares)	520,929	268,326
Shares reserved for employee stock purchase plan (in shares)	149,894	267,877
Total (in shares)	1,380,628	927,928
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	459,805	151,725
Unvested Subscription Restricted Share Awards [Member]
Restricted stock units outstanding (in shares)	250,000
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)		240,000

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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

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