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v3.23.1

Note 5 - Financial Instruments Measured at Fair Value (Tables) | 3 Months Ended
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Apr. 01, 2023
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | April 1, 2023 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 36,670 |  |  | $ | 23 |  |  | $ | 149 |  |  | $ | 36,544 |
Bank certificates of deposit |  |  | 24,500 |  |  |  | 11 |  |  |  | 23 |  |  |  | 24,488 |
U.S. treasury securities |  |  | 23,137 |  |  |  | 47 |  |  |  | 286 |  |  |  | 22,898 |
Asset-backed securities |  |  | 12,932 |  |  |  | - |  |  |  | 64 |  |  |  | 12,868 |
Foreign government security |  |  | 848 |  |  |  | - |  |  |  | - |  |  |  | 848 |
|  | $ | 98,087 |  |  | $ | 81 |  |  | $ | 522 |  |  | $ | 97,646 |
|  | December 31, 2022 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 59,283 |  |  | $ | 30 |  |  | $ | 240 |  |  | $ | 59,073 |
Bank certificates of deposit |  |  | 36,500 |  |  |  | 20 |  |  |  | 41 |  |  |  | 36,479 |
U.S. treasury securities |  |  | 34,614 |  |  |  | 1 |  |  |  | 418 |  |  |  | 34,197 |
Asset-backed securities |  |  | 12,727 |  |  |  | 10 |  |  |  | 79 |  |  |  | 12,658 |
Foreign government security |  |  | 828 |  |  |  | - |  |  |  | - |  |  |  | 828 |
|  | $ | 143,952 |  |  | $ | 61 |  |  | $ | 778 |  |  | $ | 143,235 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | April 1, 2023 |  |  | December 31, 2022 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 66,392 |  |  | $ | 66,139 |  |  | $ | 112,956 |  |  | $ | 112,683 |
Due after one year through three years |  |  | 31,695 |  |  |  | 31,507 |  |  |  | 30,996 |  |  |  | 30,552 |
|  | $ | 98,087 |  |  | $ | 97,646 |  |  | $ | 143,952 |  |  | $ | 143,235 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at April 1, 2023 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 166,925 |  |  | $ | - |  |  | $ | - |  |  | $ | 166,925 |
U.S. treasury securities |  |  | - |  |  |  | 29,886 |  |  |  | - |  |  |  | 29,886 |
Corporate debt securities |  |  | - |  |  |  | 39,282 |  |  |  | - |  |  |  | 39,282 |
Asset-backed securities |  |  | - |  |  |  | 12,869 |  |  |  | - |  |  |  | 12,869 |
Money market funds |  |  | - |  |  |  | 49,998 |  |  |  | - |  |  |  | 49,998 |
Bank certificates of deposit |  |  | - |  |  |  | 24,487 |  |  |  | - |  |  |  | 24,487 |
Foreign government security |  |  | - |  |  |  | 848 |  |  |  | - |  |  |  | 848 |
|  | $ | 166,925 |  |  | $ | 157,370 |  |  | $ | - |  |  | $ | 324,295 |
|  | Fair value measurements at December 31, 2022 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 190,371 |  |  | $ | - |  |  | $ | - |  |  | $ | 190,371 |
Corporate debt securities |  |  | - |  |  |  | 69,753 |  |  |  | - |  |  |  | 69,753 |
Money market funds |  |  | - |  |  |  | 40,290 |  |  |  | - |  |  |  | 40,290 |
Bank certificates of deposit |  |  | - |  |  |  | 37,480 |  |  |  | - |  |  |  | 37,480 |
U.S. treasury securities |  |  | - |  |  |  | 34,196 |  |  |  | - |  |  |  | 34,196 |
Asset-backed securities |  |  | - |  |  |  | 12,658 |  |  |  | - |  |  |  | 12,658 |
Foreign government security |  |  | - |  |  |  | 828 |  |  |  | - |  |  |  | 828 |
|  | $ | 190,371 |  |  | $ | 195,205 |  |  | $ | - |  |  | $ | 385,576 |

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