Note 9 - Income Taxes - Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rate to Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Tax provision at U.S. 21% statutory rate	$ 40,392	$ (2,757)	$ (15,136)
State income taxes, net of federal tax benefit	2,246	(1,160)	(1,097)
Settlements, adjustments and releases from statute expirations	(787)	(118)	(1,204)
Federal R&D credits	(943)	(46)	(1,458)
Stock-based compensation	(4,802)	727	587
Excess executive compensation	1,608	491	190
Change in valuation allowance	(9,882)	(1,691)	11,270
Exemption of PTG gain	(12,378)	0	0
Dividend, net of foreign tax credits	693	1,224	1,453
GILTI, net of foreign tax credits	9,343	4,191	2,480
Foreign rate differential	(1,023)	(1,512)	(1,266)
Other, net	552	1,317	1,099
Income Tax Expense (Benefit), Total	$ 25,019	$ 666	$ (3,082)