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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Sep. 27, 2025 | Dec. 28, 2024
--- | --- | ---
Amortized cost |  | $ 48,152 | $ 55,666
Gross unrealized gains |  | 65 | 62
Gross unrealized losses | [1] | 4 | 43
Short term investment |  | 48,213 | 55,685
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 21,716 | 32,040
Gross unrealized gains | [2] | 21 | 37
Gross unrealized losses | [1] | 2 | 25
Short term investment | [2] | 21,735 | 32,052
US Treasury Securities [Member] |  |  |
Amortized cost |  | 9,645 | 11,964
Gross unrealized gains |  | 30 | 12
Gross unrealized losses | [1] | 2 | 15
Short term investment |  | 9,673 | 11,961
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 12,870 | 6,971
Gross unrealized gains |  | 9 | 4
Gross unrealized losses | [1] | 0 | 3
Short term investment |  | 12,879 | 6,972
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 2,880 | 3,647
Gross unrealized gains |  | 5 | 6
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | 2,885 | 3,653
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 711 | 714
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | 711 | 714
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost |  | 330 | 330
Gross unrealized gains |  | 0 | 3
Gross unrealized losses | [1] | 0 | 0
Short term investment |  | $ 330 | $ 333
[1] | As of September 27, 2025, the cost and fair value of investments with loss positions were both approximately $10.2 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 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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