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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. 25, 2022 | Dec. 25, 2021
--- | --- | ---
Short-term investments |  | $ 87,495 | $ 89,704
US Treasury Securities [Member] |  |  |
Short-term investments |  | 8,617 | 3,948
Corporate Debt Securities [Member] |  |  |
Short-term investments | [1] | 63,215 | 84,031
Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 4,103 |
Certificates of Deposit [Member] |  |  |
Short-term investments |  | 10,719 | 800
Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 841 | 925
Fair Value, Recurring [Member] |  |  |
Assets, Fair Value Disclosure, Total |  | 368,081 | 379,905
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 8,618 | 3,948
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 70,207 | 86,535
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 4,103 |
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 10,719 | 800
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 841 | 925
Fair Value, Recurring [Member] | Cash [Member] |  |  |
Cash and cash equivalents |  | 221,695 | 195,297
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents |  | 51,898 | 92,400
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure, Total |  | 221,695 | 195,297
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] | Corporate Debt 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 |
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] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash [Member] |  |  |
Cash and cash equivalents |  | 221,695 | 195,297
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure, Total |  | 146,386 | 184,608
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Short-term investments |  | 8,618 | 3,948
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Short-term investments |  | 70,207 | 86,535
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Short-term investments |  | 4,103 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |  |
Short-term investments |  | 10,719 | 800
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 841 | 925
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents |  | 51,898 | 92,400
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure, Total |  | 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] | Corporate Debt 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 |
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] | Debt Security, Government, Non-US [Member] |  |  |
Short-term investments |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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