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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Sep. 24, 2022 | Dec. 25, 2021
--- | --- | ---
Amortized cost |  | $ 137,886 | $ 89,738
Gross unrealized gains |  | 15 | 2
Gross unrealized losses | [1] | 918 | 36
Short-term investments |  | 136,983 | 89,704
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 72,632 | 84,060
Gross unrealized gains | [2] | 6 | 2
Gross unrealized losses | [1],[2] | 371 | 31
Short-term investments | [2] | 72,267 | 84,031
US Treasury Securities [Member] |  |  |
Amortized cost |  | 32,522 | 3,953
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 422 | 5
Short-term investments |  | 32,100 | 3,948
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 23,325 | 800
Gross unrealized gains |  | 9 | 0
Gross unrealized losses | [1] | 51 | 0
Short-term investments |  | 23,283 | 800
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 783 | 925
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short-term investments |  | 783 | $ 925
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 8,624 |
Gross unrealized gains |  | 0 |
Gross unrealized losses | [1] | 74 |
Short-term investments |  | $ 8,550 |
[1] | As of September 24, 2022, the cost and fair value of investments with loss positions was approximately $119.3 million and $118.4 million, respectively. As of December 25, 2021, the cost and fair value of investments with loss positions was approximately $57.0 million. 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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