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Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 28, 2024 | Dec. 30, 2023
--- | --- | ---
Short-term investments |  | $ 79,976 | $ 90,174
Corporate Debt Securities [Member] |  |  |
Short-term investments | [1] | 50,626 | 45,237
US Treasury Securities [Member] |  |  |
Short-term investments |  | 16,873 | 20,349
Certificates of Deposit [Member] |  |  |
Short-term investments |  | 8,574 | 15,488
Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,837 | 8,024
Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 732 | 741
US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 334 | 335
Fair Value, Recurring [Member] |  |  |
Assets, Fair Value Disclosure |  | 269,238 | 335,698
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 70,113 | 51,949
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 16,873 | 20,349
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 8,994 | 15,488
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,837 | 8,024
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 732 | 741
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 334 | 335
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 135,158 | 157,697
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure |  | 134,080 | 178,001
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 70,113 | 51,949
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 16,873 | 20,349
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 8,994 | 15,488
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,837 | 8,024
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 732 | 741
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 334 | 335
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Cash [Member] |  |  |
Cash and cash equivalents |  | 135,158 | 157,697
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents |  | 135,158 | 157,697
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents |  | 34,197 | 81,115
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents |  | 34,197 | 81,115
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents |  | $ 0 | $ 0
[1] | Corporate debt securities include investments in financial and other corporate institutions. No single issuer represents a significant portion of the total corporate debt securities portfolio.

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