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Note 5 - Financial Instruments Measured at Fair Value (Tables) | 9 Months Ended
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Sep. 27, 2025
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | September 27, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 21,716 |  |  | $ | 21 |  |  | $ | 2 |  |  | $ | 21,735 |
Bank certificates of deposit |  |  | 12,870 |  |  |  | 9 |  |  |  | - |  |  |  | 12,879 |
U.S. treasury securities |  |  | 9,645 |  |  |  | 30 |  |  |  | 2 |  |  |  | 9,673 |
Asset-backed securities |  |  | 2,880 |  |  |  | 5 |  |  |  | - |  |  |  | 2,885 |
Foreign government security |  |  | 711 |  |  |  | - |  |  |  | - |  |  |  | 711 |
Municipal securities |  |  | 330 |  |  |  | - |  |  |  | - |  |  |  | 330 |
|  | $ | 48,152 |  |  | $ | 65 |  |  | $ | 4 |  |  | $ | 48,213 |
|  | 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] |
|  | September 27, 2025 |  |  | December 28, 2024 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 35,515 |  |  | $ | 35,537 |  |  | $ | 47,819 |  |  | $ | 47,855 |
Due after one year through five years |  |  | 12,637 |  |  |  | 12,676 |  |  |  | 7,847 |  |  |  | 7,830 |
|  | $ | 48,152 |  |  | $ | 48,213 |  |  | $ | 55,666 |  |  | $ | 55,685 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at September 27, 2025 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Cash |  | $ | 109,799 |  |  | $ | - |  |  | $ | - |  |  | $ | 109,799 |
Money market funds |  |  | - |  |  |  | 36,788 |  |  |  | - |  |  |  | 36,788 |
Corporate debt securities |  |  | - |  |  |  | 25,092 |  |  |  | - |  |  |  | 25,092 |
Bank certificates of deposit |  |  | - |  |  |  | 12,879 |  |  |  | - |  |  |  | 12,879 |
U.S. treasury securities |  |  | - |  |  |  | 9,673 |  |  |  | - |  |  |  | 9,673 |
Asset-backed securities |  |  | - |  |  |  | 2,885 |  |  |  | - |  |  |  | 2,885 |
Foreign government security |  |  | - |  |  |  | 711 |  |  |  | - |  |  |  | 711 |
Municipal securities |  |  | - |  |  |  | 330 |  |  |  | - |  |  |  | 330 |
|  | $ | 109,799 |  |  | $ | 88,358 |  |  | $ | - |  |  | $ | 198,157 |
|  | 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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