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Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | --- | ---
Exercise of options outstanding (in shares) | 0 | 42,000 | 44,500
Future grants of options or shares (in shares) | 332,232 | 619,266 |
Shares reserved for employee stock purchase plan (in shares) | 177,280 | 268,211 |
Total (in shares) | 996,546 | 1,327,211 |
Time-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 87,034 | 197,734 |
Performance-based Restricted Stock Units [Member] |  |  |
Restricted stock units outstanding (in shares) | 400,000 | 200,000 |

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