Note 6 - Employee Benefit Plans - Stock Option Activity Under Share-based Compensation Plans (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Outstanding and exercisable balance (in shares)	262	363	405
Outstanding and exercisable, weighted average exercise price, balance (in dollars per share)	$ 10.01	$ 10.27	$ 10.22
Exercised, outstanding and exercisable (in shares)	(250)	(101)	(42)
Exercised, weighted average exercise price (in dollars per share)	$ 10.03	$ 10.95	$ 9.82
Outstanding and exercisable balance (in shares)	12	262	363
Outstanding and exercisable, weighted average exercise price, balance (in dollars per share)	$ 9.44	$ 10.01	$ 10.27