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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.