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Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Dec. 31, 2022 | Jan. 01, 2022 | Jan. 02, 2021
--- | --- | --- | ---
Future grants of options or shares (in shares) | 890,682 | 107,924 | 520,929
Shares reserved for employee stock purchase plan (in shares) | 364,231 | 448,110 | 149,894
Total (in shares) | 1,754,852 | 1,101,662 | 1,380,628
Time-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 274,939 | 420,628 | 459,805
Unvested Subscription Restricted Share Awards [Member] |  |  |
Restricted stock units outstanding (in shares) | 0 | 0 | 250,000
Performance-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 225,000 | 125,000 | 0

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