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Note 9 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares | Apr. 01, 2023 | Dec. 31, 2022
--- | --- | ---
Future grants of options or shares (in shares) | 632,094 | 890,682
Shares reserved for employee stock purchase plan (in shares) | 331,160 | 364,231
Total (in shares) | 1,534,350 | 1,754,852
Time-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 471,096 | 274,939
Performance-based Restricted Stock Units [Member] |  |
Restricted stock units outstanding (in shares) | 100,000 | 0
Performance-based Restricted Stock Units Under Plans to Be Approved by Shareholders [Member] |  |
Restricted stock units outstanding (in shares) | 0 | 225,000

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