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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Jun. 27, 2026 | Dec. 27, 2025
--- | --- | ---
Amortized cost |  | $ 278,894 | $ 256,769
Gross unrealized gains |  | 56 | 172
Gross unrealized losses | [1] | 391 | 13
Short term investment |  | 278,559 | 256,928
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 149,657 | 150,314
Gross unrealized gains | [2] | 48 | 60
Gross unrealized losses | [1] | 161 | 13
Short term investment | [2] | 149,544 | 150,361
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 76,610 | 58,130
Gross unrealized gains |  | 6 | 26
Gross unrealized losses | [1] | 66 | 0
Short term investment |  | 76,550 | 58,156
US Treasury Securities [Member] |  |  |
Amortized cost |  | 33,139 | 37,584
Gross unrealized gains |  | 2 | 68
Gross unrealized losses | [1] | 134 | 0
Short term investment |  | 33,007 | 37,652
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 18,767 | 10,038
Gross unrealized gains |  | 0 | 18
Gross unrealized losses | [1] | 30 | 0
Short term investment |  | 18,737 | 10,056
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 721 | 703
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | $ 721 | $ 703
[1] | As of June 27, 2026, the cost and fair value of investments with loss positions were approximately $216.1 million and $215.7 million, respectively. As of December 27, 2025, the cost and fair value of investments with loss positions were both approximately $58.3 million. 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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