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Note 5 - Financial Instruments Measured at Fair Value (Tables) | 12 Months Ended
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Dec. 27, 2025
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | At December 27, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 150,314 |  |  | $ | 60 |  |  | $ | 13 |  |  | $ | 150,361 |
Bank certificates of deposit |  |  | 58,130 |  |  |  | 26 |  |  |  | - |  |  |  | 58,156 |
U.S. treasury securities |  |  | 37,584 |  |  |  | 68 |  |  |  | - |  |  |  | 37,652 |
Asset-backed securities |  |  | 10,038 |  |  |  | 18 |  |  |  | - |  |  |  | 10,056 |
Foreign government security |  |  | 703 |  |  |  | - |  |  |  | - |  |  |  | 703 |
|  | $ | 256,769 |  |  | $ | 172 |  |  | $ | 13 |  |  | $ | 256,928 |
|  | At December 28, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 32,040 |  |  | $ | 37 |  |  | $ | 25 |  |  | $ | 32,052 |
U.S. treasury securities |  |  | 11,964 |  |  |  | 12 |  |  |  | 15 |  |  |  | 11,961 |
Bank certificates of deposit |  |  | 6,971 |  |  |  | 4 |  |  |  | 3 |  |  |  | 6,972 |
Asset-backed securities |  |  | 3,647 |  |  |  | 6 |  |  |  | - |  |  |  | 3,653 |
Foreign government security |  |  | 714 |  |  |  | - |  |  |  | - |  |  |  | 714 |
Municipal securities |  |  | 330 |  |  |  | 3 |  |  |  | - |  |  |  | 333 |
|  | $ | 55,666 |  |  | $ | 62 |  |  | $ | 43 |  |  | $ | 55,685 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
(in thousands) |  | Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 200,379 |  |  | $ | 200,436 |
Due after 1 year through 5 years |  |  | 56,390 |  |  |  | 56,492 |
|  | $ | 256,769 |  |  | $ | 256,928 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at December 27, 2025 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 142,091 |  |  | $ | - |  |  | $ | - |  |  | $ | 142,091 |
Corporate debt securities |  |  | - |  |  |  | 183,611 |  |  |  | - |  |  |  | 183,611 |
Bank certificates of deposit |  |  | - |  |  |  | 58,156 |  |  |  | - |  |  |  | 58,156 |
Money market funds |  |  | - |  |  |  | 51,712 |  |  |  | - |  |  |  | 51,712 |
U.S. treasury securities |  |  | - |  |  |  | 37,652 |  |  |  | - |  |  |  | 37,652 |
Asset-backed securities |  |  | - |  |  |  | 10,056 |  |  |  | - |  |  |  | 10,056 |
Foreign government security |  |  | - |  |  |  | 703 |  |  |  | - |  |  |  | 703 |
|  | $ | 142,091 |  |  | $ | 341,890 |  |  | $ | - |  |  | $ | 483,981 |
|  | Fair value measurements at December 28, 2024 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 136,965 |  |  | $ | - |  |  | $ | - |  |  | $ | 136,965 |
Money market funds |  |  | - |  |  |  | 69,442 |  |  |  | - |  |  |  | 69,442 |
Corporate debt securities |  |  | - |  |  |  | 32,052 |  |  |  | - |  |  |  | 32,052 |
U.S. treasury securities |  |  | - |  |  |  | 11,961 |  |  |  | - |  |  |  | 11,961 |
Bank certificates of deposit |  |  | - |  |  |  | 6,972 |  |  |  | - |  |  |  | 6,972 |
Asset-backed securities |  |  | - |  |  |  | 3,653 |  |  |  | - |  |  |  | 3,653 |
Municipal securities |  |  | - |  |  |  | 333 |  |  |  | - |  |  |  | 333 |
Foreign government security |  |  | - |  |  |  | 714 |  |  |  | - |  |  |  | 714 |
|  | $ | 136,965 |  |  | $ | 125,127 |  |  | $ | - |  |  | $ | 262,092 |

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