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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Jun. 25, 2022 | Dec. 25, 2021
--- | --- | ---
Amortized cost |  | $ 88,028 | $ 89,738
Gross unrealized gains |  | 4 | 2
Gross unrealized losses | [1] | 537 | 36
Short-term investments |  | 87,495 | 89,704
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 63,577 | 84,060
Gross unrealized gains | [2] | 3 | 2
Gross unrealized losses | [1],[2] | 365 | 31
Short-term investments | [2] | 63,215 | 84,031
US Treasury Securities [Member] |  |  |
Amortized cost |  | 8,722 | 3,953
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 105 | 5
Short-term investments |  | 8,617 | 3,948
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 10,750 | 800
Gross unrealized gains |  | 1 | 0
Gross unrealized losses | [1] | 32 | 0
Short-term investments |  | 10,719 | 800
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 841 | 925
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short-term investments |  | 841 | $ 925
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 4,138 |
Gross unrealized gains |  | 0 |
Gross unrealized losses | [1] | 35 |
Short-term investments |  | $ 4,103 |
[1] | As of June 25, 2022 and December 25, 2021, the cost and fair value of investments with loss positions were approximately $79.7 million and $57.0 million, respectively. We evaluated the nature of these investments, credit worthiness of the issuer and the duration of these impairments to determine if an other-than-temporary decline in fair value had occurred and concluded that these losses were temporary and we have the ability and intent to hold these investments to maturity.
[2] | 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, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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