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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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