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v3.22.2

Note 5 - Financial Instruments Measured at Fair Value (Tables) | 6 Months Ended
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Jun. 25, 2022
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | June 25, 2022 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 63,577 |  |  | $ | 3 |  |  | $ | 365 |  |  | $ | 63,215 |
U.S. treasury securities |  |  | 8,722 |  |  |  | - |  |  |  | 105 |  |  |  | 8,617 |
Bank certificates of deposit |  |  | 10,750 |  |  |  | 1 |  |  |  | 32 |  |  |  | 10,719 |
Foreign government security |  |  | 841 |  |  |  | - |  |  |  | - |  |  |  | 841 |
Asset-backed securities |  |  | 4,138 |  |  |  | - |  |  |  | 35 |  |  |  | 4,103 |
|  | $ | 88,028 |  |  | $ | 4 |  |  | $ | 537 |  |  | $ | 87,495 |
|  | December 25, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 84,060 |  |  | $ | 2 |  |  | $ | 31 |  |  | $ | 84,031 |
U.S. treasury securities |  |  | 3,953 |  |  |  | - |  |  |  | 5 |  |  |  | 3,948 |
Bank certificates of deposit |  |  | 800 |  |  |  | - |  |  |  | - |  |  |  | 800 |
Foreign government security |  |  | 925 |  |  |  | - |  |  |  | - |  |  |  | 925 |
|  | $ | 89,738 |  |  | $ | 2 |  |  | $ | 36 |  |  | $ | 89,704 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 25, 2022 |  |  | December 25, 2021 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 71,917 |  |  | $ | 71,636 |  |  | $ | 83,429 |  |  | $ | 83,408 |
Due after one year through three years |  |  | 16,111 |  |  |  | 15,859 |  |  |  | 6,309 |  |  |  | 6,296 |
|  | $ | 88,028 |  |  | $ | 87,495 |  |  | $ | 89,738 |  |  | $ | 89,704 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at June 25, 2022 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 221,695 |  |  | $ | - |  |  | $ | - |  |  | $ | 221,695 |
U.S. treasury securities |  |  | - |  |  |  | 8,618 |  |  |  | - |  |  |  | 8,618 |
Corporate debt securities |  |  | - |  |  |  | 70,207 |  |  |  | - |  |  |  | 70,207 |
Asset-backed securities |  |  | - |  |  |  | 4,103 |  |  |  | - |  |  |  | 4,103 |
Money market funds |  |  | - |  |  |  | 51,898 |  |  |  | - |  |  |  | 51,898 |
Bank certificates of deposit |  |  | - |  |  |  | 10,719 |  |  |  | - |  |  |  | 10,719 |
Foreign government security |  |  | - |  |  |  | 841 |  |  |  | - |  |  |  | 841 |
|  | $ | 221,695 |  |  | $ | 146,386 |  |  | $ | - |  |  | $ | 368,081 |
|  | Fair value measurements at December 25, 2021 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 195,297 |  |  | $ | - |  |  | $ | - |  |  | $ | 195,297 |
Corporate debt securities |  |  | - |  |  |  | 86,535 |  |  |  | - |  |  |  | 86,535 |
U.S. treasury securities |  |  | - |  |  |  | 3,948 |  |  |  | - |  |  |  | 3,948 |
Money market funds |  |  | - |  |  |  | 92,400 |  |  |  | - |  |  |  | 92,400 |
Bank certificates of deposit |  |  | - |  |  |  | 800 |  |  |  | - |  |  |  | 800 |
Foreign government security |  |  | - |  |  |  | 925 |  |  |  | - |  |  |  | 925 |
|  | $ | 195,297 |  |  | $ | 184,608 |  |  | $ | - |  |  | $ | 379,905 |

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