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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. 27, 2025 | Dec. 28, 2024
--- | --- | ---
Short-term investments |  | $ 48,213 | $ 55,685
Corporate Debt Securities [Member] |  |  |
Short-term investments | [1] | 21,735 | 32,052
US Treasury Securities [Member] |  |  |
Short-term investments |  | 9,673 | 11,961
Certificates of Deposit [Member] |  |  |
Short-term investments |  | 12,879 | 6,972
Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,885 | 3,653
Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 711 | 714
US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 330 | 333
Fair Value, Recurring [Member] |  |  |
Assets, Fair Value Disclosure |  | 198,157 | 262,092
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 25,092 | 32,052
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 9,673 | 11,961
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 12,879 | 6,972
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,885 | 3,653
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 711 | 714
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 330 | 333
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 109,799 | 136,965
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 |  | 88,358 | 125,127
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 25,092 | 32,052
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 9,673 | 11,961
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 12,879 | 6,972
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 2,885 | 3,653
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 711 | 714
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Short-term investments |  | 330 | 333
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 |  | 109,799 | 136,965
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents |  | 109,799 | 136,965
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 |  | 36,788 | 69,442
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 |  | 36,788 | 69,442
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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