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Note 5 - Financial Instruments Measured at Fair Value (Tables) | 6 Months Ended
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Jun. 28, 2025
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | June 28, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 21,920 |  |  | $ | 15 |  |  | $ | 8 |  |  | $ | 21,927 |
Bank certificates of deposit |  |  | 11,590 |  |  |  | 3 |  |  |  | 1 |  |  |  | 11,592 |
U.S. treasury securities |  |  | 7,182 |  |  |  | 16 |  |  |  | 4 |  |  |  | 7,194 |
Asset-backed securities |  |  | 3,201 |  |  |  | 1 |  |  |  | 1 |  |  |  | 3,201 |
Foreign government security |  |  | 730 |  |  |  | - |  |  |  | - |  |  |  | 730 |
Municipal securities |  |  | 330 |  |  |  | 1 |  |  |  | - |  |  |  | 331 |
|  | $ | 44,953 |  |  | $ | 36 |  |  | $ | 14 |  |  | $ | 44,975 |
|  |  | 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] |
|  | June 28, 2025 |  |  | December 28, 2024 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 33,170 |  |  | $ | 33,173 |  |  | $ | 47,819 |  |  | $ | 47,855 |
Due after one year through five years |  |  | 11,783 |  |  |  | 11,802 |  |  |  | 7,847 |  |  |  | 7,830 |
|  | $ | 44,953 |  |  | $ | 44,975 |  |  | $ | 55,666 |  |  | $ | 55,685 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at June 28, 2025 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Cash |  | $ | 121,557 |  |  | $ | - |  |  | $ | - |  |  | $ | 121,557 |
Money market funds |  |  | - |  |  |  | 36,788 |  |  |  | - |  |  |  | 36,788 |
Corporate debt securities |  |  | - |  |  |  | 28,018 |  |  |  | - |  |  |  | 28,018 |
Bank certificates of deposit |  |  | - |  |  |  | 11,592 |  |  |  | - |  |  |  | 11,592 |
U.S. treasury securities |  |  | - |  |  |  | 7,194 |  |  |  | - |  |  |  | 7,194 |
Asset-backed securities |  |  | - |  |  |  | 3,201 |  |  |  | - |  |  |  | 3,201 |
Foreign government security |  |  | - |  |  |  | 730 |  |  |  | - |  |  |  | 730 |
Municipal securities |  |  | - |  |  |  | 331 |  |  |  | - |  |  |  | 331 |
|  | $ | 121,557 |  |  | $ | 87,854 |  |  | $ | - |  |  | $ | 209,411 |
|  | 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 |
Foreign government security |  |  | - |  |  |  | 714 |  |  |  | - |  |  |  | 714 |
Municipal securities |  |  | - |  |  |  | 333 |  |  |  | - |  |  |  | 333 |
|  | $ | 136,965 |  |  | $ | 125,127 |  |  | $ | - |  |  | $ | 262,092 |

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