Note 8 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Inventory, receivable and warranty reserves	$ 11,896	$ 12,560
Net operating loss carryforwards	69,096	65,587
Tax credit carryforwards	36,489	34,251
Accrued employee benefits	4,685	5,134
Stock-based compensation	2,372	2,108
Lease liabilities	7,890
Other	7,885	7,827
Gross deferred tax assets	140,313	127,467
Less valuation allowance	(93,498)	(84,718)
Total deferred tax assets	46,815	42,749
Depreciation and fixed asset related	948	3,156
Intangible assets and other acquisition basis differences	62,325	70,415
Operating lease right-of-use assets	7,504
Unremitted earnings of foreign subsidiaries	2,462	5,257
Total deferred tax liabilities	73,239	78,828
Net deferred tax liabilities	$ (26,424)	$ (36,079)