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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Dec. 27, 2025 | Dec. 28, 2024
--- | --- | ---
Amortized cost |  | $ 256,769 | $ 55,666
Gross unrealized gains |  | 172 | 62
Gross unrealized losses | [1] | 13 | 43
Short term investment |  | 256,928 | 55,685
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 150,314 | 32,040
Gross unrealized gains | [2] | 60 | 37
Gross unrealized losses | [1] | 13 | 25
Short term investment | [2] | 150,361 | 32,052
US Treasury Securities [Member] |  |  |
Amortized cost |  | 37,584 | 11,964
Gross unrealized gains |  | 68 | 12
Gross unrealized losses | [1] | 0 | 15
Short term investment |  | 37,652 | 11,961
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 58,130 | 6,971
Gross unrealized gains |  | 26 | 4
Gross unrealized losses | [1] | 0 | 3
Short term investment |  | 58,156 | 6,972
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 10,038 | 3,647
Gross unrealized gains |  | 18 | 6
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | 10,056 | 3,653
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 703 | 714
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | $ 703 | 714
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost |  |  | 330
Gross unrealized gains |  |  | 3
Gross unrealized losses | [1] |  | 0
Short term investment |  |  | $ 333
[1] | As of December 27, 2025, the cost and fair value of investments with loss positions were both approximately $58.3 million. As of December 28, 2024, the cost and fair value of investments with loss positions was approximately $20.5 million and $20.4 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-related 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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