Note 13 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Net income	$ 104,488	$ 80,866	$ 98,100
Basic (in shares)	22,559	22,565	22,543
Effect of dilutive securities (in shares)	167	154	184
Diluted (in shares)	22,727	22,719	22,727
Earnings Per Share:
Basic (in dollars per share)	$ 4.63	$ 3.58	$ 4.35
Diluted (in dollars per share)	$ 4.60	$ 3.56	$ 4.32