Note 6 - Stock Options Outstanding and Exercisable (Details) shares in Thousands	12 Months Ended
	Dec. 26, 2015 $ / shares shares
Range 1 [Member]
Range of Exercise Prices, Lower (in dollars per share)	$ 7.32
Range of Exercise Prices, Upper (in dollars per share)	$ 10.58
Number Outstanding (in shares) | shares	1,182
Options Outstanding, Weighted Average Remaining Life	5 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.82
Options Exercisable (in shares) | shares	922
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.54
Range 2 [Member]
Range of Exercise Prices, Lower (in dollars per share)	10.59
Range of Exercise Prices, Upper (in dollars per share)	$ 15.50
Number Outstanding (in shares) | shares	498
Options Outstanding, Weighted Average Remaining Life	4 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 14.06
Options Exercisable (in shares) | shares	466
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 14.26
Range 3 [Member]
Range of Exercise Prices, Lower (in dollars per share)	15.51
Range of Exercise Prices, Upper (in dollars per share)	$ 20.73
Number Outstanding (in shares) | shares	285
Options Outstanding, Weighted Average Remaining Life	1 year 255 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.44
Options Exercisable (in shares) | shares	285
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 16.44
Number Outstanding (in shares) | shares	1,965
Options Outstanding, Weighted Average Remaining Life	4 years 146 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.25
Options Exercisable (in shares) | shares	1,673
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.47