Note 6 - Employee Benefit Plans - Performance Based Stock Unit Activity Under Share-based Compensation Plans (Details) - Equity Based Performance Stock Units [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Outstanding, beginning of year, units (in shares)	403	384	425
Outstanding, beginning of year, wt. avg. (in dollars per share)	$ 28.64	$ 22.22	$ 15.51
Granted, units (in shares)	270	151	93
Granted, wt. avg. (in dollars per share)	$ 39.97	$ 33.22	$ 51.43
Released, units (in shares)	(258)	(55)	(125)
Released, wt. avg. (in dollars per share)	$ 13.18	$ 14.11	$ 21.77
Cancelled, units (in shares)	(7)	(77)	(9)
Cancelled, wt. avg. (in dollars per share)	$ 42.52	$ 15.94	$ 14.04
Outstanding, end of year, units (in shares)	408	403	384
Outstanding, end of year, wt. avg. (in dollars per share)	$ 45.65	$ 28.64	$ 22.22