Note 9 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Apr. 02, 2022	Jan. 01, 2022
Future grants of options or shares (in shares)	2,924	107,924
Shares reserved for employee stock purchase plan (in shares)	410,977	448,110
Total (in shares)	883,854	1,101,662
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	369,953	420,628
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	75,000	125,000
Performance-based Restricted Stock Units Under Plans to Be Approved by Shareholders [Member]
Restricted stock units outstanding (in shares)	25,000	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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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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-Publisher FASB
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