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Note 9 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Jul. 02, 2022	Jan. 01, 2022
Future grants of options or shares (in shares)	46,182	107,924
Shares reserved for employee stock purchase plan (in shares)	410,977	448,110
Total (in shares)	876,354	1,101,662
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	319,195	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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- Definition

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+ References

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- Definition

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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)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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