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Note 5 - Financial Instruments Measured at Fair Value (Tables) | 6 Months Ended
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Jun. 29, 2024
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | June 29, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 32,822 |  |  | $ | 29 |  |  | $ | 37 |  |  | $ | 32,814 |
U.S. treasury securities |  |  | 13,471 |  |  |  | - |  |  |  | 17 |  |  |  | 13,454 |
Bank certificates of deposit |  |  | 8,170 |  |  |  | 1 |  |  |  | 1 |  |  |  | 8,170 |
Asset-backed securities |  |  | 3,856 |  |  |  | 3 |  |  |  | 1 |  |  |  | 3,858 |
Foreign government security |  |  | 702 |  |  |  | - |  |  |  | - |  |  |  | 702 |
Municipal securities |  |  | 330 |  |  |  | 1 |  |  |  | - |  |  |  | 331 |
|  | $ | 59,351 |  |  | $ | 34 |  |  | $ | 56 |  |  | $ | 59,329 |
|  | December 30, 2023 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 45,105 |  |  | $ | 147 |  |  | $ | 15 |  |  | $ | 45,237 |
U.S. treasury securities |  |  | 20,439 |  |  |  | 26 |  |  |  | 116 |  |  |  | 20,349 |
Bank certificates of deposit |  |  | 15,468 |  |  |  | 20 |  |  |  | - |  |  |  | 15,488 |
Asset-backed securities |  |  | 8,017 |  |  |  | 17 |  |  |  | 10 |  |  |  | 8,024 |
Foreign government security |  |  | 741 |  |  |  | - |  |  |  | - |  |  |  | 741 |
Municipal securities |  |  | 330 |  |  |  | 5 |  |  |  | - |  |  |  | 335 |
|  | $ | 90,100 |  |  | $ | 215 |  |  | $ | 141 |  |  | $ | 90,174 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 29, 2024 |  |  | December 30, 2023 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 40,377 |  |  | $ | 40,346 |  |  | $ | 57,981 |  |  | $ | 57,887 |
Due after one year through five years |  |  | 18,974 |  |  |  | 18,983 |  |  |  | 31,378 |  |  |  | 31,546 |
Due after five years through ten years |  |  | - |  |  |  | - |  |  |  | 741 |  |  |  | 741 |
|  | $ | 59,351 |  |  | $ | 59,329 |  |  | $ | 90,100 |  |  | $ | 90,174 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at June 29, 2024 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Cash |  | $ | 169,955 |  |  | $ | - |  |  | $ | - |  |  | $ | 169,955 |
Corporate debt securities |  |  | - |  |  |  | 33,563 |  |  |  | - |  |  |  | 33,563 |
Money market funds |  |  | - |  |  |  | 32,364 |  |  |  | - |  |  |  | 32,364 |
U.S. treasury securities |  |  | - |  |  |  | 13,454 |  |  |  | - |  |  |  | 13,454 |
Bank certificates of deposit |  |  | - |  |  |  | 8,170 |  |  |  | - |  |  |  | 8,170 |
Asset-backed securities |  |  | - |  |  |  | 3,858 |  |  |  | - |  |  |  | 3,858 |
Foreign government security |  |  | - |  |  |  | 702 |  |  |  | - |  |  |  | 702 |
Municipal securities |  |  | - |  |  |  | 331 |  |  |  | - |  |  |  | 331 |
|  | $ | 169,955 |  |  | $ | 92,442 |  |  | $ | - |  |  | $ | 262,397 |
|  | Fair value measurements at December 30, 2023 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Cash |  | $ | 157,697 |  |  | $ | - |  |  | $ | - |  |  | $ | 157,697 |
Money market funds |  |  | - |  |  |  | 81,115 |  |  |  | - |  |  |  | 81,115 |
Corporate debt securities |  |  | - |  |  |  | 51,949 |  |  |  | - |  |  |  | 51,949 |
U.S. treasury securities |  |  | - |  |  |  | 20,349 |  |  |  | - |  |  |  | 20,349 |
Bank certificates of deposit |  |  | - |  |  |  | 15,488 |  |  |  | - |  |  |  | 15,488 |
Asset-backed securities |  |  | - |  |  |  | 8,024 |  |  |  | - |  |  |  | 8,024 |
Foreign government security |  |  | - |  |  |  | 741 |  |  |  | - |  |  |  | 741 |
Municipal securities |  |  | - |  |  |  | 335 |  |  |  | - |  |  |  | 335 |
|  | $ | 157,697 |  |  | $ | 178,001 |  |  | $ | - |  |  | $ | 335,698 |

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