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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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