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Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 27, 2025	Dec. 28, 2024
Short-term investments		$ 48,213	$ 55,685
Corporate Debt Securities [Member]
Short-term investments	[1]	21,735	32,052
US Treasury Securities [Member]
Short-term investments		9,673	11,961
Certificates of Deposit [Member]
Short-term investments		12,879	6,972
Asset-Backed Securities [Member]
Short-term investments		2,885	3,653
Debt Security, Government, Non-US [Member]
Short-term investments		711	714
US States and Political Subdivisions Debt Securities [Member]
Short-term investments		330	333
Fair Value, Recurring [Member]
Assets, Fair Value Disclosure		198,157	262,092
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Short-term investments		25,092	32,052
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Short-term investments		9,673	11,961
Fair Value, Recurring [Member] | Certificates of Deposit [Member]
Short-term investments		12,879	6,972
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Short-term investments		2,885	3,653
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member]
Short-term investments		711	714
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Short-term investments		330	333
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure		109,799	136,965
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Security, Government, Non-US [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure		88,358	125,127
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Short-term investments		25,092	32,052
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Short-term investments		9,673	11,961
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Short-term investments		12,879	6,972
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member]
Short-term investments		2,885	3,653
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member]
Short-term investments		711	714
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Short-term investments		330	333
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Security, Government, Non-US [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Short-term investments		0	0
Fair Value, Recurring [Member] | Cash [Member]
Cash and cash equivalents		109,799	136,965
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		109,799	136,965
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		0	0
Fair Value, Recurring [Member] | Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		0	0
Fair Value, Recurring [Member] | Money Market Funds [Member]
Cash and cash equivalents		36,788	69,442
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		0	0
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		36,788	69,442
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		$ 0	$ 0
[1] 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.

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