Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands		Mar. 29, 2025	Dec. 28, 2024
Amortized cost		$ 48,908	$ 55,666
Gross unrealized gains		43	62
Gross unrealized losses	[1]	19	43
Short term investment		48,932	55,685
Corporate Debt Securities [Member]
Amortized cost	[2]	29,426	32,040
Gross unrealized gains	[2]	27	37
Gross unrealized losses	[1]	12	25
Short term investment	[2]	29,441	32,052
US Treasury Securities [Member]
Amortized cost		4,727	11,964
Gross unrealized gains		7	12
Gross unrealized losses	[1]	5	15
Short term investment		4,729	11,961
Certificates of Deposit [Member]
Amortized cost		9,511	6,971
Gross unrealized gains		4	4
Gross unrealized losses	[1]	1	3
Short term investment		9,514	6,972
Asset-Backed Securities [Member]
Amortized cost		4,194	3,647
Gross unrealized gains		3	6
Gross unrealized losses	[1]	1	0
Short term investment		4,196	3,653
Debt Security, Government, Non-US [Member]
Amortized cost		720	714
Gross unrealized gains		0	0
Gross unrealized losses	[1]	0	0
Short term investment		720	714
US States and Political Subdivisions Debt Securities [Member]
Amortized cost		330	330
Gross unrealized gains		2	3
Gross unrealized losses	[1]	0	0
Short term investment		$ 332	$ 333

[1] As of March 29, 2025, the cost and fair value of investments with loss positions were approximately $22.4 million and $22.3 million, respectively. 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.