Note 6 - Stock Option Activity under Share-based Compensation Plans (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Outstanding, beginning of year (in shares)	2,435	3,086	3,113
Outstanding, beginning of year (in dollars per share)	$ 11.67	$ 11.93	$ 12.62
Granted (in shares)	10	10	470
Granted (in dollars per share)	$ 10.98	$ 12.58	$ 9.83
Exercised (in shares)	(175)	(237)	(117)
Exercised (in dollars per share)	$ 8.65	$ 8.43	$ 7.55
Cancelled (in shares)	(305)	(424)	(380)
Cancelled (in dollars per share)	$ 16.07	$ 15.37	$ 16.37
Outstanding, end of year (in shares)	1,965	2,435	3,086
Outstanding, end of year (in dollars per share)	$ 11.25	$ 11.67	$ 11.93
Options exercisable at year end (in shares)	1,673	1,901	2,195
Options exercisable at year end (in dollars per share)	$ 11.47	$ 12.08	$ 12.46