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Note 3 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 24, 2022 | Jun. 25, 2022 | Dec. 25, 2021 | Dec. 24, 2022 | Dec. 25, 2021 | Mar. 28, 2020
Share-Based Payment Arrangement, Expense, Tax Benefit |  |  |  | $ 0.5 | $ 1.7 |
Share-Based Payment Arrangement, Expense |  |  |  | $ 2.8 | 1.7 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 |  | 0 | 56,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 0.00% |  | 0.00% | 0.00% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  | $ 0.2 | 6.9 |
Proceeds from Stock Options Exercised |  |  |  | $ 0.1 | $ 1.0 |
Board of Directors Member [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 10,000 |  |
Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 46,000 | 25,000 |
Share-Based Payment Arrangement, Employee [Member] | Each of Five Employees [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 2,000 |
Share-Based Payment Arrangement, Employee [Member] | Five Employees [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 10,000 |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Target Level Acheived |  |  |  |  |  | 82.00%
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  | 16,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 1.7 | $ 1.2 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 2.7 |  |  | $ 2.7 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 5 years |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 1.1 | $ 0.4 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 2.2 |  |  | $ 2.2 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 3 years |  |
Share-Based Payment Arrangement, Option [Member] | Board of Directors Member [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 5 years |  |
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member] | Five Employees [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member] | Company Employees, Two [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 5 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 90,000 |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  | 5 years |  |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 5 years |
The 2021 Plan [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 700,000 |  |  | 700,000 |  |

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