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Note 5 - Financial Instruments Measured at Fair Value (Tables) | 9 Months Ended
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Sep. 28, 2024
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | September 28, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 50,457 |  |  | $ | 171 |  |  | $ | 2 |  |  | $ | 50,626 |
U.S. treasury securities |  |  | 16,827 |  |  |  | 47 |  |  |  | 1 |  |  |  | 16,873 |
Bank certificates of deposit |  |  | 8,562 |  |  |  | 12 |  |  |  | - |  |  |  | 8,574 |
Asset-backed securities |  |  | 2,827 |  |  |  | 10 |  |  |  | - |  |  |  | 2,837 |
Foreign government security |  |  | 732 |  |  |  | - |  |  |  | - |  |  |  | 732 |
Municipal securities |  |  | 330 |  |  |  | 4 |  |  |  | - |  |  |  | 334 |
|  | $ | 79,735 |  |  | $ | 244 |  |  | $ | 3 |  |  | $ | 79,976 |
|  | 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] |
|  | September 28, 2024 |  |  | December 30, 2023 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 66,546 |  |  | $ | 66,708 |  |  | $ | 57,981 |  |  | $ | 57,887 |
Due after one year through five years |  |  | 13,189 |  |  |  | 13,268 |  |  |  | 31,378 |  |  |  | 31,546 |
Due after five years through ten years |  |  | - |  |  |  | - |  |  |  | 741 |  |  |  | 741 |
|  | $ | 79,735 |  |  | $ | 79,976 |  |  | $ | 90,100 |  |  | $ | 90,174 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at September 28, 2024 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Cash |  | $ | 135,158 |  |  | $ | - |  |  | $ | - |  |  | $ | 135,158 |
Corporate debt securities |  |  | - |  |  |  | 70,113 |  |  |  | - |  |  |  | 70,113 |
Money market funds |  |  | - |  |  |  | 34,197 |  |  |  | - |  |  |  | 34,197 |
U.S. treasury securities |  |  | - |  |  |  | 16,873 |  |  |  | - |  |  |  | 16,873 |
Bank certificates of deposit |  |  | - |  |  |  | 8,994 |  |  |  | - |  |  |  | 8,994 |
Asset-backed securities |  |  | - |  |  |  | 2,837 |  |  |  | - |  |  |  | 2,837 |
Foreign government security |  |  | - |  |  |  | 732 |  |  |  | - |  |  |  | 732 |
Municipal securities |  |  | - |  |  |  | 334 |  |  |  | - |  |  |  | 334 |
|  | $ | 135,158 |  |  | $ | 134,080 |  |  | $ | - |  |  | $ | 269,238 |
|  | 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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