Note 2 - Correction of Immaterial Errors - Effects of Adjustments to Correct Immaterial Errors, Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Jan. 02, 2016	Dec. 27, 2014
Scenario, Previously Reported [Member]
Net income			$ 82,466	$ 99,418
Accrued taxes			(1,043)	(549)
Net cash provided by operating activities			165,826	153,141
Restatement Adjustment [Member]
Net income			(1,600)	(1,318)
Accrued taxes			1,600	1,318
Net cash provided by operating activities
Net income	$ 77,243	$ 60,003	80,866	98,100
Accrued taxes	(23,613)	4,006	557	769
Net cash provided by operating activities	$ 100,015	$ 113,583	$ 165,826	$ 153,141