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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.