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Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Jun. 27, 2020 | Dec. 28, 2019
--- | --- | ---
Future grants of options or shares (in shares) | 91,744 | 268,326
Shares reserved for employee stock purchase plan (in shares) | 210,626 | 267,877
Total (in shares) | 744,095 | 927,928
Time-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 281,725 | 151,725
Performance-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 160,000 | 240,000

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