Note 18 - Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 27, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	2014								2013
	4Qa		3Qb		2Qc		1Qd		4Qe		3Qf		2Qg		1Qh
Net sales	$	206,620	$	217,608	$	220,908	$	206,859	$	198,129	$	201,040	$	187,766	$	170,918
Gross profit		75,559		87,380		82,995		78,494		77,109		80,960		73,557		64,606
Operating income		26,391		40,130		33,719		33,590		32,823		37,559		31,382		28,117
Net income (as previously reported)		19,511		29,940		24,578		25,389		23,658		26,990		26,648		14,794
Tax adjustment(d)		—		—		—		—		—		—		—		(3,306	)
Net income (Q1 2013 as restated)		19,511		29,940		24,578		25,389		23,658		26,990		26,648		11,488
Net income per share (as reported):
Basic	$	0.86	$	1.33	$	1.09	$	1.13	$	1.05	$	1.20	$	1.19	$	0.67
Diluted	$	0.86	$	1.32	$	1.08	$	1.12	$	1.04	$	1.19	$	1.18	$	0.66
Impact of tax adjustment:
Basic	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	(0.15	)
Diluted	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	(0.15	)
Net income per share (Q1 2013 as restated):
Basic	$	0.86	$	1.33	$	1.09	$	1.13	$	1.05	$	1.20	$	1.19	$	0.52
Diluted	$	0.86	$	1.32	$	1.08	$	1.12	$	1.04	$	1.19	$	1.18	$	0.51