Note 6 - Employee Benefit Plans - Stock Options Outstanding and Exercisable (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Number Outstanding (in shares)	363	405	472	1,641
Options Outstanding, Weighted Average Remaining Life (Year)	2 years 292 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.27	$ 10.22	$ 10.20	$ 10.79
Options Exercisable (in shares)	363	405	469
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.27	$ 10.22	$ 10.20
Range 1 [Member]
Range of Exercise Prices, Lower (in dollars per share)	9.44
Range of Exercise Prices, Upper (in dollars per share)	$ 10.54
Number Outstanding (in shares)	200
Options Outstanding, Weighted Average Remaining Life (Year)	3 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.50
Options Exercisable (in shares)	200
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.50
Range 2 [Member]
Range of Exercise Prices, Lower (in dollars per share)	10.55
Range of Exercise Prices, Upper (in dollars per share)	$ 10.58
Number Outstanding (in shares)	126
Options Outstanding, Weighted Average Remaining Life (Year)	2 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.58
Options Exercisable (in shares)	126
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.58
Range 3 [Member]
Range of Exercise Prices, Lower (in dollars per share)	10.59
Range of Exercise Prices, Upper (in dollars per share)	$ 15.89
Number Outstanding (in shares)	37
Options Outstanding, Weighted Average Remaining Life (Year)	2 years 109 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.32
Options Exercisable (in shares)	37
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 13.23