Note 17 - Computation of Basic and Diluted Earnings Per Share under the Two-class Method (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Net income as reported	$ 82,466	$ 99,418	$ 88,784
Less: Distributed earnings available to participating securities			(35)
Less: Undistributed earnings available to participating securities			(16)
Numerator for basic earnings per share —
Undistributed and distributed earnings available to common shareholders	$ 82,466	$ 99,418	88,733
Add: Undistributed earnings allocated to participating securities			16
Less: Undistributed earnings reallocated to participating securities			(16)
Numerator for diluted earnings per share —
Undistributed and distributed earnings available to common shareholders	$ 82,466	$ 99,418	$ 88,733
Denominator for basic earnings per share —
Weighted-average shares (in shares)	22,565	22,543	22,315
Effect of dilutive securities:
Common stock equivalents (in shares)	154	184	222
Denominator for diluted earnings per share —
Adjusted for weighted-average shares & assumed conversions (in shares)	22,719	22,727	22,537
Basic earnings per share (in dollars per share)	$ 3.65	$ 4.41	$ 3.98
Diluted earnings per share (in dollars per share)	$ 3.63	$ 4.37	$ 3.94