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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($)
$ in Thousands
Sep. 28, 2024
Dec. 30, 2023
Amortized cost $ 79,735 $ 90,100
Gross unrealized gains 244 215
Gross unrealized losses [1] 3 141
Short term investment 79,976 90,174
Corporate Debt Securities [Member]    
Amortized cost [2] 50,457 45,105
Gross unrealized gains [2] 171 147
Gross unrealized losses [1],[2] 2 15
Short term investment [2] 50,626 45,237
US Treasury Securities [Member]    
Amortized cost 16,827 20,439
Gross unrealized gains 47 26
Gross unrealized losses [1] 1 116
Short term investment 16,873 20,349
Certificates of Deposit [Member]    
Amortized cost 8,562 15,468
Gross unrealized gains 12 20
Gross unrealized losses [1] 0 0
Short term investment 8,574 15,488
Asset-Backed Securities [Member]    
Amortized cost 2,827 8,017
Gross unrealized gains 10 17
Gross unrealized losses [1] 0 10
Short term investment 2,837 8,024
Debt Security, Government, Non-US [Member]    
Amortized cost 732 741
Gross unrealized gains 0 0
Gross unrealized losses [1] 0 0
Short term investment 732 741
US States and Political Subdivisions Debt Securities [Member]    
Amortized cost 330 330
Gross unrealized gains 4 5
Gross unrealized losses [1] 0 0
Short term investment $ 334 $ 335
[1] As of September 28, 2024, the cost and fair value of investments with loss positions were both approximately $11.5 million. As of December 30, 2023, the cost and fair value of investments with loss positions was approximately $38.5 million and $38.4 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.