Note 6 - Employee Benefit Plans - Stock Options Outstanding and Exercisable (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Number Outstanding (in shares)	405	472	1,641	1,965
Options Outstanding, Weighted Average Remaining Life (Year)	3 years 219 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.22	$ 10.20	$ 10.79	$ 11.25
Options Exercisable (in shares)	405	469	1,537
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.22	$ 10.20	$ 10.85
Range 1 [Member]
Range of Exercise Prices, Lower (in dollars per share)	7.32
Range of Exercise Prices, Upper (in dollars per share)	$ 9,440
Number Outstanding (in shares)	225
Options Outstanding, Weighted Average Remaining Life (Year)	4 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9,350
Options Exercisable (in shares)	225
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.35
Range 2 [Member]
Range of Exercise Prices, Lower (in dollars per share)	9.45
Range of Exercise Prices, Upper (in dollars per share)	$ 10.54
Number Outstanding (in shares)	10
Options Outstanding, Weighted Average Remaining Life (Year)	3 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.54
Options Exercisable (in shares)	10
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.54
Range 3 [Member]
Range of Exercise Prices, Lower (in dollars per share)	10.55
Range of Exercise Prices, Upper (in dollars per share)	$ 15.89
Number Outstanding (in shares)	170
Options Outstanding, Weighted Average Remaining Life (Year)	3 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.34
Options Exercisable (in shares)	170
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.34