Note 10 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Inventory, receivable and warranty reserves	$ 11,034	$ 10,931
Other assets (long-term)	138,156	124,016
Net operating loss carryforwards	39,572	36,602
Long-term deferred income tax liabilities	(19,402)	(23,154)
Tax credit carryforwards	35,788	34,637
Net deferred tax liabilities	(14,319)	(16,958)
Capitalized R&D	35,348	30,485
Accrued employee benefits	3,742	3,348
Stock-based compensation	4,511	3,227
Lease liabilities	2,544	3,222
Uniform capitalization	2,553	1,564
Other	3,064	0
Gross deferred tax assets	138,156	124,016
Less valuation allowance	(114,517)	(99,888)
Total deferred tax assets	23,639	24,128
Intangible assets and other acquisition basis differences	25,848	34,076
Operating lease right-of-use assets	2,226	2,854
Unremitted earnings of foreign subsidiaries	4,898	4,106
Other	4,986	50
Total deferred tax liabilities	37,958	41,086
Other Noncurrent Assets [Member]
Other assets (long-term)	5,083	6,196
Gross deferred tax assets	$ 5,083	$ 6,196