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Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Dec. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2022
--- | --- | --- | ---
Future grants of options or shares (in shares) | 603,044 | 890,682 | 107,924
Shares reserved for employee stock purchase plan (in shares) | 297,730 | 364,231 | 448,110
Total (in shares) | 1,377,392 | 1,754,852 | 1,101,662
Time-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 376,618 | 274,939 | 420,628
Performance-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 100,000 | 225,000 | 125,000

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