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Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 27, 2026 | Dec. 27, 2025
--- | --- | ---
Short-term investments |  | $ 278,559 | $ 256,928
Corporate Debt Securities [Member] |  |  |
Short-term investments | [1] | 149,544 | 150,361
Certificates of Deposit [Member] |  |  |
Short-term investments |  | 76,550 | 58,156
US Treasury Securities [Member] |  |  |
Short-term investments |  | 33,007 | 37,652
Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 18,737 | 10,056
Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 721 | 703
Fair Value, Recurring [Member] |  |  |
Assets, Fair Value Disclosure |  | 498,167 | 483,981
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 165,527 | 183,611
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 76,550 | 58,156
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 33,008 | 37,652
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 18,737 | 10,056
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 721 | 703
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 122,616 | 142,091
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] | Certificates of Deposit [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] | 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 2 [Member] |  |  |
Assets, Fair Value Disclosure |  | 375,551 | 341,890
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 165,527 | 183,611
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 76,550 | 58,156
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 33,008 | 37,652
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 18,737 | 10,056
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 721 | 703
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] | Certificates of Deposit [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] | 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] | Cash [Member] |  |  |
Cash and cash equivalents |  | 122,616 | 142,091
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents |  | 122,616 | 142,091
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 |  | 81,008 | 51,712
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 |  | 81,008 | 51,712
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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