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Note 9 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Sep. 27, 2025 | Dec. 28, 2024
--- | --- | ---
Future grants of options or shares (in shares) | 247,417 | 295,680
Shares reserved for employee stock purchase plan (in shares) | 216,574 | 252,119
Total (in shares) | 982,502 | 1,137,220
Time-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 231,248 | 289,421
Performance-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 287,263 | 300,000

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