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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Jun. 29, 2024 | Dec. 30, 2023
--- | --- | ---
Amortized cost |  | $ 59,351 | $ 90,100
Gross unrealized gains |  | 34 | 215
Gross unrealized losses | [1] | 56 | 141
Short-term investments |  | 59,329 | 90,174
Estimated fair value |  | 59,329 | 90,174
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 32,822 | 45,105
Gross unrealized gains | [2] | 29 | 147
Gross unrealized losses | [1],[2] | 37 | 15
Short-term investments | [2] | 32,814 | 45,237
Estimated fair value | [2] | 32,814 | 45,237
US Treasury Securities [Member] |  |  |
Amortized cost |  | 13,471 | 20,439
Gross unrealized gains |  | 0 | 26
Gross unrealized losses | [1] | 17 | 116
Short-term investments |  | 13,454 | 20,349
Estimated fair value |  | 13,454 | 20,349
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 8,170 | 15,468
Gross unrealized gains |  | 1 | 20
Gross unrealized losses | [1] | 1 | 0
Short-term investments |  | 8,170 | 15,488
Estimated fair value |  | 8,170 | 15,488
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 3,856 | 8,017
Gross unrealized gains |  | 3 | 17
Gross unrealized losses |  | 1 | 10
Short-term investments |  | 3,858 | 8,024
Estimated fair value |  | 3,858 | 8,024
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 702 | 741
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short-term investments |  | 702 | 741
Estimated fair value |  | 702 | 741
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost |  | 330 | 330
Gross unrealized gains |  | 1 | 5
Gross unrealized losses |  | 0 | 0
Short-term investments |  | 331 | 335
Estimated fair value |  | $ 331 | $ 335
[1] | As of June 29, 2024, the cost and fair value of investments with loss positions was approximately $30.6 million and $30.5 million, respectively. As of December 30, 2023, the cost and fair value of investments with loss positions was approximately $38.5 million and $38.4 million, respectively. We evaluated the nature of these investments, credit worthiness of the issuer and the duration of these impairments to determine if a credit loss exists. 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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