Note 8 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Inventory, receivable and warranty reserves	$ 12,560	$ 3,417
Net operating loss carryforwards	65,587	7,467
Tax credit carryforwards	34,251	14,724
Accrued employee benefits	5,134	4,796
Deferred profit and gain on facility sale	3,032	3,617
Stock-based compensation	2,108	1,897
Acquisition basis differences	1,158	1,606
Other	3,637	208
Gross deferred tax assets	127,467	37,732
Less valuation allowance	(84,718)	(31,491)
Total deferred tax assets	42,749	6,241
Depreciation and fixed asset related	3,156	120
Intangible assets and other acquisition basis differences	70,415	5,518
Unremitted earnings of foreign subsidiaries	5,257	2,002
Other		437
Total deferred tax liabilities	78,828	8,077
Net deferred tax liabilities	$ (36,079)	$ (1,836)