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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.